🔭 Space Glossary

Deep Space & Astrophysics

Concepts in deep-space exploration and astrophysics — exoplanets, biosignatures, space telescopes, and the Lagrange points that enable observation from beyond Earth orbit. 5 terms, each explained in plain language with key data and links to live trackers.

B Biosignature Chemical or physical indicator of past or present life O₂, CH₄, O₃, N₂O, DMSDMS on K2-18 b (2023) E Exoplanet A planet orbiting a star outside our solar system 5,700+ HZ Habitable Zone The region around a star where liquid water could exist on a planet's surface 0.95–1.67 AU3 (e, f, g) L2 Gravitational equilibrium point 1.5 million km from Earth, anti-sunward ~1.5 million km~151 million km LY Light-Year The distance light travels in one year — about 9.46 trillion km 9.461 × 10¹² km299,792 km/s

More glossary categories

All terms 🌐 Orbit Types 📐 Orbital Elements 📡 Tracking & Space Surveillance 🚀 Manoeuvres & Propulsion 🛡️ Debris & Space Safety 🛰️ Spacecraft Systems 🏗️ Launch & Ascent ☀️ Space Environment ⚖️ Policy & Regulation 📍 Navigation & Timing 🔭 Earth Observation 📡 Amateur Radio & Satellites 👨‍🚀 Human Spaceflight 🌐 Satellite Internet & Mega-Constellations 🪐 Planetary Science & Exploration