9th Grade Radial Velocity Quizzes , Questions & Answers

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Celestial Tug-of-War: Why Stars Wobble Quiz

It’s a two-way street in space. While a star pulls on a planet, the planet’s gravity also gives the star a tiny, rhythmic tug. This why stars wobble quiz explores the gravitational dance that gives away a...

Questions: 20 | Attempts: 12 | Last updated: Feb 24, 2026

Sample Question 1
What is the fundamental reason why stars wobble when they have orbiting planets?

Stars are naturally unstable and shake

The star and planet orbit a common center of mass

The star is being pushed by solar winds

The planet's magnetic field repels the star

The star is trying to escape the galaxy

Sample Question 2
A gravity tug from planets is only possible if the planet is larger than the star itself.

True

False

The Planet Hunters: Kepler and TESS Missions Quiz

The dedicated hunters of the deep sky. Specialized telescopes orbiting Earth have found thousands of planets by staring at the stars for years. This kepler and tess missions quiz highlights the history and tech behind our...

Questions: 20 | Attempts: 11 | Last updated: Feb 20, 2026

Sample Question 1
What was the primary scientific objective of the Kepler mission?

To find life on Mars

To determine how common Earth-sized planets are in the Milky Way

To photograph the surfaces of distant stars

To measure the expansion of the universe

To study the rings of Saturn

Sample Question 2
Compared to Kepler, the TESS mission is designed to survey a much larger area of the sky.

True

False

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