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Ten Most Powerful Space Telescopes

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July 05, 2025

Prelims: Current events of National and International Importance | science and technology.

 Why in news?

 Space telescopes are frequently in news due to ongoing discoveries and advancements in space exploration.

  • Space telescopes — Telescopes that orbit above the Earth’s atmosphere to observe the Universe (planets, stars, galaxies) closely with significant clarity.
  • Advantages - They can access to a wider electromagnetic spectrum, enabling them to detect the wavelengths of light (such as X-rays, gamma rays, infrared).
    •  Unaffected by weather, daynight cycles, they enable long-duration exposures uninterrupted cosmic observation.
    • Bypassing atmospheric blurriness can capture clear images.

The first ever space telescope, the Orbiting Astronomical Observatory 2 (OAO-2), was launched into the low Earth orbit in 1968 aboard an Atlas-Centaur rocket, as per the National Space Centre.

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Telescope

Description

1.

James Webb Space Telescope

  • Launched in - 2021.
  • largest and the most powerful observatory.
  • designed to conduct infrared astronomy.
  • Agencies overlooking - NASA, ESA, CSA.

2.

Hubble Space Telescope

  • Launched in - 1990.
  • Discovering dark energy, observes the cosmos in ultraviolet, visible and near infrared, from the low Earth orbit.
  • Operated by - NASA and ESA.

3.

Chandra X-ray observatory

  • Launched in - 1999. NASA’s flagship mission for X-ray astronomy, detects X-ray emissions.
  • The electrical power required to cooperate the Chandra spacecraft and instruments is very less (2KW).

4.

Spitzer Space Telescope

  • Launched in - 2003, NASA’s, retired in 2020.
  • Spitzer made the first exoplanet weather map of temperature variations over the surface of a gas exoplanet.

5.

Planck Space Observatory

  • Launched in - 2009.
  • ESA’s first mission to study the Cosmic Microwave Background (CMB), the relic radiation from the Big Bang.

6.

Gaia

  • Launched in - 2013.
  • The telescope’s extraordinarily precise three-dimensional map will provide the data needed to tackle history of our galaxy.

7.

Fermi Gamma-ray Space Telescope

  • Launched in - 2008.
  • NASA’s telescope detects gamma rays, the most energetic form of light.
  • to address questions revolving around “crushed stellar remnants like pulsars.

8.

TESS (Transiting Exoplant Survey Satellite)

  • Launched in - 2018 as a follow-up to Kepler, NASA’s TESS is responsible for discovering exoplanets.

9.

Euclid Space Telescope

  • ESA mission with critical contributions from NASA that aims to explore dark matter and dark energy.

10.

XRISM (X-ray Imaging and Spectroscopy Mission)

  • Launched in - 2023, NASA has partnering with JAXA on the XRISM mission to study celestial objects that emit X-rays.

 

Reference

Indian express| 10 most powerful space telescopes

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