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  • arxiv.org
    2024-11-29 00:00:00 -
    https://arxiv.org/abs/1712.08139
    Hubble Space Telescope Trigonometric Parallax of Polaris B, Companion of the Nearest Cepheid
    Polaris, the nearest and brightest Cepheid, is a potential anchor point for the Leavitt period-luminosity relation. However, its distance is a matter of contention, with recent advocacy for a parallax of ~10 mas, in contrast with the Hipparcos measurement of 7.54+/-0.11 mas. We report an independent trigonometric parallax determination, using the Fine Guidance Sensors (FGS) on the Hubble Space Telescope. Polaris itself is too bright for FGS, so we measured its 8th-magnitude companion Polaris B, relative to a network of background reference stars. We converted the FGS relative parallax to absolute, using estimated distances to the reference stars from ground-based photometry and spectral classification. Our result, 6.26+/-0.24 mas, is even smaller than found by Hipparcos. We note other objects for which Hipparcos appears to have overestimated parallaxes, including the well-established case of the Pleiades. We consider possible sources of systematic error in the FGS parallax, but find no evidence they are significant. If our "long" distance is correct, the high luminosity of Polaris indicates that it is pulsating in the second overtone of its fundamental mode. Our results raise several puzzles, including a long pulsation period for Polaris compared to second-overtone pulsators in the Magellanic Clouds, and a conflict between the isochrone age of Polaris B (~2.1 Gyr) and the much younger age of Polaris A. We discuss possibilities that B is not a physical companion of A, in spite of the strong evidence that it is, or that one of the stars is a merger remnant. These issues may be resolved when Gaia provides parallaxes for both stars.
    ARXIV.ORG
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  • en.wikipedia.org
    2023-04-03 07:27:22 -
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
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    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
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  • arxiv.org
    2024-12-02 00:00:00 -
    https://arxiv.org/abs/astro-ph/0605530
    Shedding New Light on the 3C 273 Jet with the Spitzer Space Telescope
    We have performed infrared imaging of the jet of the quasar 3C 273 at wavelengths 3.6 and 5.8 microns with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. When combined with the radio, optical and X-ray measurements, the IRAC photometry clearly shows that the optical emission is dominated by the high-energy component of the jet, not by the radio synchrotron component, as had been assumed to date. The high-energy component may be due to a second synchrotron component or to IC scattering of ambient photons. In the former case, we argue that the acceleration of protons exceeding 10^16 eV or possibly even to 10^19 eV would be taking place in the jet. In contrast, the IC model, into which highly relativistic Doppler beaming has to be incorporated, requires very low-energy electrons (~ 1 MeV). The present polarization data in the radio and optical would favor the former interpretation in the case of the 3C 273 jet. Sensitive and detailed measurements of optical polarization are important to establish the radiation mechanism responsible for the high-energy emission. The present study offers new clues as to the controversial origin of the X-ray emission seen in many quasar jets.
    ARXIV.ORG
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    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
    https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
    Spitzer Space Telescope
    The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, following IRAS (1983) and ISO (1995–1998). It was the first spacecraft to use an Earth-trailing orbit, later used by the Kepler planet-finder. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments were no longer usable. However, the two shortest-wavelength modules of the IRAC camera continued to operate with the same sensitivity as before the helium was exhausted, and continued to be used into early 2020 in the Spitzer Warm Mission.During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature...
    EN.WIKIPEDIA.ORG
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  • wikipedia.org
    2024-09-07 00:00:00 -
    https://simple.wikipedia.org/wiki/Space_warfare
    Space warfare
    Space warfare is combat that occurs in outer space. As of 2024, no large-scale battle or war is known to have taken place in space, though a number of single-event tests had been performed. In reality so far, It has only happened once on 31 October 2023 during the Red Sea Crisis. The Houthi movement launched a ballistic missile from Yemen towards Israel. Israel's Arrow System shot down the ballistic missile above Earth's atmosphere above the Negev Desert. Related pages Anti-satellite weapon List of military operations during 2024 References
    SIMPLE.WIKIPEDIA.ORG
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  • en.wikipedia.org
    2023-04-14 05:15:59 -
    https://en.wikipedia.org/wiki/Space_adaptation_syndrome
    Space adaptation syndrome
    Space adaptation syndrome (SAS) or space sickness is a condition experienced by as many as half of all space travelers during their adaptation to weightlessness once in orbit. It is the opposite of terrestrial motion sickness since it occurs when the environment and the person appear visually to be in motion relative to one another even though there is no corresponding sensation of bodily movement originating from the vestibular system. Presentation Space motion sickness can lead to degraded astronaut performance. SMS threatens operational requirements, reduces situational awareness, and threatens the safety of those exposed to micro-g environments. Lost muscle mass leads to difficulty with movement, especially when astronauts return to earth. This can pose a safety issue if the need for emergency egress were to arise. Loss of muscle power makes it extremely difficult, if not impossible, for astronauts to climb through emergency egress hatches or create unconventional exit spaces in the case of a crash upon landing. Additionally, bone resorption and inadequate hydration in space can lead to the formation of kidney...
    EN.WIKIPEDIA.ORG
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  • Harvard University
    2024-09-24 00:00:00 -
    https://ui.adsabs.harvard.edu/abs/1962PhRv..128..919F
    Causality and Multiply Connected Space-Time
    With the introduction of multiply connected topologies into physics, a question of causality arises. There are alternative routes between two points in a multiply connected space. Therefore, one may ask if a signal traveling at the speed of light along one route could be outpaced by a signal which has traveled a much shorter path through a handle or "wormhole." This paper examines one such situation and shows that in this example causality is preserved. It proves essential in the analysis to distinguish between those regions of space-time which are catastrophic and those which are not. A catastrophic region is composed of catastrophic points. A catastrophic point in space-time is so located with respect to eventual singularities in the intrinsic geometry that every time-like geodesic through it necessarily runs into a region of infinite curvature at some time in the future-or was born out of a region of infinite curvature at some time in the past-or both. If a classical analysis of nature were possible-which it is not-then it would be natural to postulate that laboratory physics is carried out in noncatastrophic regions of space-time. Two such regions are shown to exist in the example considered in the paper. It is shown that no signal can ever be sent from one to the other. The key point in preventing any violation of causality is simple: The (Schwarzschild) throat of the wormhole pinches off in a finite time and traps the signal in a region of infinite curvature. This investigation also displays some of the unusual geometric features of the Schwarzschild solution of Einstein's equations for a spherically symmetrical center of attraction. Radial spacelike geodesics passing through the throat are calculated and it is shown that there exist regions of space-time unreachable by any radial geodesics that issue from a given point. Also, there exist points in space-time from which light signals can never be received no matter how long one waits.
    UI.ADSABS.HARVARD.EDU
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  • ChatGPT AI
    2023-03-23 21:42:08 -

    _prefix;
    }
    if(value_path == "ipv6-mcast-address")
    {
    ipv6_mcast_address = value;
    ipv6_mcast_address.value_namespace = name_space;
    ipv6_mcast_address.value_namespace_prefix = name_space_prefix;
    }
    if(value_path == "ipv6-label-address")
    {
    ipv6_label_address = value;
    ipv6_label_address.value_namespace = name_space;
    ipv6_label_address.value

    By: ChatGPT AI
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  • ChatGPT AI
    2023-03-26 05:57:52 -

    (s string) string {
    return strings.Replace(s, " ", "%20", -1)
    }

    By: ChatGPT AI
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  • ChatGPT AI
    2023-04-11 16:14:22 -



    The James Webb Space Telescope (JWST) is a space telescope that is set to launch in 2021. It is the successor to the Hubble Space Telescope, and will be the most powerful space telescope ever built. The JWST will be able to observe objects in infrared light, allowing it to see much farther into space and time than any other telescope. It will also be able to detect planets outside of our solar system, and study the atmospheres of those planets. The JWST will help us better understand the formation and evolution of galaxies, stars, and planets, as well as provide new insights into the origin of life in our universe.

    By: ChatGPT AI
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  • ChatGPT AI
    2023-04-14 05:15:30 -



    Space adaptation syndrome (SAS) is a condition experienced by astronauts and cosmonauts during their first few days in space. It is caused by the lack of gravity and the associated sensory changes. Symptoms include nausea, vomiting, dizziness, headaches, fatigue, and disorientation. Astronauts may also experience difficulty sleeping and concentrating due to the unfamiliar environment. SAS usually resolves itself within a few days as astronauts adjust to their new environment.

    By: ChatGPT AI
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  • ChatGPT AI
    2023-04-21 04:56:13 -



    The European Space Agency (ESA) is an intergovernmental organization of 22 member states dedicated to the exploration of space. The ESA's mission is to shape the development of Europe's space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world. The ESA's activities include human and robotic spaceflight, Earth observation, science, navigation, telecommunications, exploration of Mars and the Moon, aeronautics, technology development, and operations.

    By: ChatGPT AI
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  • ChatGPT AI
    2023-04-25 05:47:21 -



    Space ice cream is a type of freeze-dried ice cream that was created to be eaten in space. It is typically sold in small packages and is made by freezing a mixture of milk, sugar, and flavorings. The mixture is then dried and compressed into a solid form. Space ice cream can be eaten without being rehydrated, making it an ideal snack for astronauts in space.

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  • youtube.com
    2026-03-18 12:31:23 -
    Top 10 Mysteries Of Outer Space | Unraveling the Secrets of the Universe (Full Documentary)
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
    YouTube
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  • youtube.com
    2022-06-20 21:39:32 -
    Tom Hanks on Going to Space, New Movie Finch & the Passing of His Dear Friend Peter Scolari
    Tom talks about doing a talk show again, being the only human in his movie Finch, acting with a dog named Seamus, the idea of ...
    YouTube
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  • NPR.org
    2025-02-12 00:00:00 -
    npr
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  • youtube.com
    2026-03-19 13:35:00 -
    “The Power of Telescopes: Exploring Space, Galaxies, and the Secrets of the Universe
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
    YouTube
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  • youtube.com
    2026-03-26 23:32:34 -
    The Space Journey | Exploring the Universe Beyond Earth
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
    YouTube
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  • NASA
    2026-03-19 15:31:10 -
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