Misplaced Pages

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Space telescope" – news · newspapers · books · scholar · JSTOR (November 2023) (Learn how and when to remove this message)

A space telescope (also known as space observatory) is a telescope in outer space used to observe astronomical objects. Suggested by Lyman Spitzer in 1946, the first operational telescopes were the American Orbiting Astronomical Observatory, OAO-2 launched in 1968, and the Soviet Orion 1 ultraviolet telescope aboard space station Salyut 1 in 1971. Space telescopes avoid several problems caused by the atmosphere, including the absorption or scattering of certain wavelengths of light, obstruction by clouds, and distortions due to atmospheric refraction such as twinkling. Space telescopes can also observe dim objects during the daytime, and they avoid light pollution which ground-based observatories encounter. They are divided into two types: Satellites which map the entire sky (astronomical survey), and satellites which focus on selected astronomical objects or parts of the sky and beyond. Space telescopes are distinct from Earth imaging satellites, which point toward Earth for satellite imaging, applied for weather analysis, espionage, and other types of information gathering.

History

In 1946, American theoretical astrophysicist Lyman Spitzer, "father of Hubble" proposed to put a telescope in space. Spitzer's proposal called for a large telescope that would not be hindered by Earth's atmosphere. After lobbying in the 1960s and 70s for such a system to be built, Spitzer's vision ultimately materialized into the Hubble Space Telescope, which was launched on April 24, 1990, by the Space Shuttle Discovery (STS-31). This was launched due to many efforts by Nancy Grace Roman, "mother of Hubble", who was the first Chief of Astronomy and first female executive at NASA. She was a program scientist that worked to convince NASA, Congress, and others that Hubble was "very well worth doing".

The first operational space telescopes were the American Orbiting Astronomical Observatory, OAO-2 launched in 1968, and the Soviet Orion 1 ultraviolet telescope aboard space station Salyut 1 in 1971.

Advantages

Performing astronomy from ground-based observatories on Earth is limited by the filtering and distortion of electromagnetic radiation (scintillation or twinkling) due to the atmosphere. A telescope orbiting Earth outside the atmosphere is subject neither to twinkling nor to light pollution from artificial light sources on Earth. As a result, the angular resolution of space telescopes is often much higher than a ground-based telescope with a similar aperture. Many larger terrestrial telescopes, however, reduce atmospheric effects with adaptive optics.

Space-based astronomy is more important for frequency ranges that are outside the optical window and the radio window, the only two wavelength ranges of the electromagnetic spectrum that are not severely attenuated by the atmosphere. For example, X-ray astronomy is nearly impossible when done from Earth, and has reached its current importance in astronomy only due to orbiting X-ray telescopes such as the Chandra X-ray Observatory and the XMM-Newton observatory. Infrared and ultraviolet are also largely blocked.

Disadvantages

Space telescopes are much more expensive to build than ground-based telescopes. Due to their location, space telescopes are also extremely difficult to maintain. The Hubble Space Telescope was serviced by the Space Shuttle, but most space telescopes cannot be serviced at all.

Future of space observatories

Satellites have been launched and operated by NASA, ISRO, ESA, CNSA, JAXA and the Soviet space program (later succeeded by Roscosmos of Russia). As of 2022, many space observatories have already completed their missions, while others continue operating on extended time. However, the future availability of space telescopes and observatories depends on timely and sufficient funding. While future space observatories are planned by NASA, JAXA and the CNSA, scientists fear that there would be gaps in coverage that would not be covered immediately by future projects and this would affect research in fundamental science.

On 16 January 2023, NASA announced preliminary considerations of several future space telescope programs, including the Great Observatory Technology Maturation Program, Habitable Worlds Observatory, and New Great Observatories.

List of space telescopes

See also

• Airborne observatory
• Balloon-borne telescope
• Earth observation satellite
• List of telescope types
• Timeline of artificial satellites and space probes
• Timeline of telescopes, observatories, and observing technology
• Ultraviolet astronomy
• X-ray telescope

References

1. "Lyman Spitzer - NASA Science". science.nasa.gov. Retrieved 7 January 2024.
2. "Hubble Essentials: About Lyman Spitzer, Jr". Hubble Site. Space Telescope Science Institute.
3. "Hubble Essentials: Quick Facts". Hubble Site. Space Telescope Science Institute.
4. "The mother of hubble". June 4, 2024.
5. "Dr. Nancy Grace Roman (1925-2018) - NASA Science". science.nasa.gov. Retrieved 2024-06-05.
6. ^ "Why a Telescope in Space? - NASA Science". science.nasa.gov. Retrieved 7 January 2024.
7. Kaplan, Sarah (18 October 2018). "As NASA's Telescopes Falter, Astronomers Fear Losing Their Eyes In Space". NDTV.com. Retrieved 19 October 2018.
8. Foust, Jeff (16 January 2023). "NASA prepares next steps in development of future large space telescope". SpaceNews. Retrieved 24 January 2023.
9. O'Callaghan, Jonthan (23 January 2023). "JWST Heralds a New Dawn for Exoplanet Science - The James Webb Space Telescope is opening an exciting new chapter in the study of exoplanets and the search for life beyond Earth". Scientific American. Retrieved 24 January 2023.

Further reading

• Lyman Spitzer, "Astronomical Advantages of an Extra-terrestrial Observatory", 1946
• Neil English: Space Telescopes – Capturing the Rays of the Electromagnetic Spectrum. Springer, Cham 2017, ISBN 978-3-319-27812-4.

External links

• Media related to Space telescopes at Wikimedia Commons·
• Space telescopes with frequencies, at GSFC.

v t e ... in space
Biology	Human The human body Hygiene Locomotion Medicine Neuroscience Psychology Psychological and sociological effects Sex Sleep Non-human Animals Cats Cockroaches Dogs Frogs Fruit flies Mice Primates Tortoises Extraterrestrial life Microorganisms Plants Astrobotany
Environment	Climate Corrosion Debris Dust Magnetosphere Weather Weathering
Society	Advertising Alcohol Archaeology of Earth of items in space Art Burial Colonization Economy Mining Trade Ethics Exploration Food Law Military Music Religion Christmas Selfies Tourism Voting War Women
Technology	Human spaceflight Accidents Architecture Farming Food Carbonated drinks Toilets Writing Other technologies Logistics Manufacturing Mining Power Batteries Nuclear Solar for Earth for spacecraft Radar Telescopes Weapons
Outer space portal

• Astronomy
• Stars
• Solar System

• American inventions
• Astronomical observatories
• Space telescopes
• Telescope types
• Uncrewed spacecraft