Gaia spacecraft Trivia Questions

Gaia orbits the Sun at the L2 Lagrange point, 1.5 million km from Earth, providing a stable thermal and viewing environment.

Gaia's primary mission is astrometry, cataloging about 1.8 billion stars with microarcsecond accuracy, far surpassing any previous mission.

While focused on stars, Gaia also observes solar system objects, discovering over 150,000 asteroids, including near-Earth ones.

Gaia uses parallax—observing stars from different angles as Earth orbits—not lasers. Lasers would be too weak for stellar distances.

Gaia confirmed the Milky Way is a barred spiral galaxy. It found evidence of past mergers but didn't change its fundamental shape.

Gaia has two telescopes feeding a 1-billion-pixel camera, but it scans continuously, not taking one static image; it builds a map over years.

Gaia's precise motions led to the discovery of SMSS J1605−1443, a star with almost no heavy elements, dating to the early universe.

Gaia's astrometry reveals binary star motions, and in 2022 it helped confirm a dormant black hole in a binary system, Gaia BH1.