Trivia Tuesday

Exoplanet & Astrophysics Trivia Tuesday Time!
Weekly trivia from the Exoplanet Slacker community. Play solo or with friends!

This Week
Latest Trivia

Format
How Trivia Tuesday Works

1) Play in Slack

Every Tuesday we post a 4–8 question multiple‑choice trivia in Slack. Vote by using Emoji's or reply in the thread with your picks.

2) Check Answers

Answers are posted in a thread inside the last question.

3) Keep Learning

Answers come with short explanations so be sure to follow up for more information! More trivia coming every Tuesday!

History
Trivia Archive

2025
December
9 December 2025 — Microlensing Planetary vs Binary-Lens, Inside-out Quenching, Radius Valley Crust-breaking, Parker Wind.
Questions (5) and answers
November
25 November 2025 — USP Planets, Morphological Quenching, Gas Giant Re-inflation, Chirp Mass, Transmission Spectra.
Questions (5) and answers
18 November 2025 — Neptune Desert, Tidal Inflation, Quenching, Class 0 Protostar, ZAMS.
Questions (5), 1 Bonus Government Open question, and answers
5 November 2025 — CνB, Cold/Hot Jupiters, Glitch, First Directly Imaged Exoplanet, Great Attractor.
Questions (5) and answers
October
21 October 2025 — ΛCDM Offset, Hot Jupiters, Helium Flash, Cepheid Paradox, Transmission Spectrum.
Questions (5) and answers
14 October 2025 — Hubble Tension, Sunyaev–Zel’dovich Effect, Schwarzschild Radius, Eddington Limit, Mutual Events.
Questions (5) and answers
7 October 2025 — 51 Pegasi b, Rotating Black Holes, Biosignature Molecule, Hertzsprung–Russell Diagram, Spectrographs.
Questions (5) and answers
September
30 September 2025 — M Dwarf's, Inflation, HWO, Stellar Nucleosynthesis, Cosmic Microwave Background.
Questions (5) and answers
23 September 2025 — Mercury's Precession, Stellar Evolution, Dark Energy, Lyman-Alpha Line, Cosmic Distance Ladder.
Questions (5) and answers
16 September 2025 — Chandrasekhar Mass Limit, Elliptical Galaxies, Spectroscopy, Pulsar Timing, Cosmic Microwave Background
Questions (5) and answers
9 September 2025 — Gravitational Redshift, TRAPPIST, Transit Duration, Globular Clusters, Hubble's Law
Questions (5) and answers
2 September 2025 — GPS, Amplitude, Einstein's Blunder, Milky Way, Cosmological Principle
Questions (5) and answers
August
19 August 2025 — Exoplanet Categories, Designations, Legrange Points, JWST
Questions (4) and answers
18 August 2025 — Rossiter-McLaughlin, Phase Curve, Synchotron, Pop I&II
Questions (4) and answers
15 August 2025 — Orbital Inclination, Resonant Orbit, Supernovae, Active Galactic Nucleus
Questions (5), answers; Pandora bonus question

Community
Submit a Trivia Question

How to contribute

DM us in Slack here. Provide your question, 4 answer options, the correct answer, and a reliable source. We’ll queue it for an upcoming Tuesday.

Template

**Question:** 
A) 
B) 
C) 
D) 
**Answer:** 
**Source:** (link)