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Gaia telescope UPSC NOTE

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  Why in news Astronomers discovered Gaia BH3 , a gigantic black hole near Earth, making it the third such black hole found by the European ...

 Why in news

  • Astronomers discovered Gaia BH3, a gigantic black hole near Earth, making it the third such black hole found by the European Space Agency's Gaia telescope.

  • This discovery adds to a series of black hole findings in our galaxy, helping to expand our understanding of these mysterious objects.

Gaia telescope

  • It was launched by the European Space Agency (ESA) in December 2013.

  • It is located 1.5 million kilometres from Earth at the second Sun-Earth Lagrange point (L2).

  • Gaia Spacecraft contains two optical telescopes that work with three science instruments to precisely determine the location of stars and their velocities, and to split their light into a spectrum for analysis.

  • It is creating an extraordinarily precise three-dimensional map of nearly two billion objects throughout our Galaxy and beyond, mapping their motions, luminosity, temperature and composition.

  • It helps identify dark objects, like black holes, by observing the effects of their gravity on nearby stars.

Doppler effect

  • It was first described in 1842 by Austrian physicist Christian Doppler.

  • When the source and the signal are in relative motion to each other there is a change in the frequency observed by the observer. 

  • If they are moving closer frequency increases and vice versa.

  • Light from a moving object is blue-shifted, while light from a moving object is redshifted

  • The Doppler effect helps astronomers detect the motion of stars near black holes.

  • As a star orbits a black hole, the light from the star shifts (toward red or blue), revealing its speed and movement.

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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Gaia telescope UPSC NOTE
Gaia telescope UPSC NOTE
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