space medium Fill in the Blank

The Gaia DR3 catalogue released in 2022 contains astrometric data for over _______ stars.

  1. 100 million
  2. 1 billion
  3. 1.8 billion
  4. 10 billion

Answer: 1.8 billion

Gaia Data Release 3 provides positions, parallaxes, and motions for ~1.8 billion sources, revolutionizing galactic archaeology and stellar physics.

Topic Astronomy - Catalogues
Exam Relevance UPSC Prelims, SSC CGL
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