Space Exploration & Extraterrestrial Life
The scientific search for alien life, from astrobiology and exoplanet discovery to SETI and the great cosmic questions.
The Fermi Paradox: Why Haven't We Found Aliens Yet?
Explore the Fermi Paradox, the contradiction between the high probability of alien civilizations and the lack of evidence for them.
8 min readThe Drake Equation: Calculating the Probability of Alien Life
Learn about the Drake Equation, the famous formula that estimates the number of communicating alien civilizations in our galaxy.
7 min readHabitable Exoplanets: Where Could Alien Life Exist?
Discover the most promising habitable exoplanets where alien life might exist, from TRAPPIST-1 worlds to nearby Proxima Centauri b.
9 min readSETI: The Scientific Search for Extraterrestrial Intelligence
The history and science of SETI, the ongoing scientific effort to detect signals from intelligent alien civilizations across the cosmos.
8 min readEvidence of Life on Mars: What NASA Has Discovered So Far
A comprehensive look at the evidence for past or present life on Mars, from Viking experiments to Perseverance rover discoveries.
9 min readEuropa's Hidden Ocean: Could Jupiter's Moon Harbor Alien Life?
Explore the evidence for Europa's subsurface ocean beneath its icy crust and why scientists consider it a top candidate for alien life.
8 min readThe Wow! Signal: Did We Receive a Message from Aliens in 1977?
The story of the Wow! Signal, the strongest candidate for an alien radio transmission ever detected, recorded at Big Ear Observatory.
7 min readSETI@home: The Screensaver That Searched for Aliens for 21 Years
SETI@home let millions of home computers sift Arecibo radio data for alien signals from 1999 to 2020. How it worked, what it found, the one false alarm, why it went into hibernation, and what replaced it.
7 min readDo Aliens Exist? What Science Actually Knows in 2026
Do aliens exist? The honest answer from astronomy, biology and the search so far: how many planets there are, what biosignature claims have held up, why nobody has answered SETI, and what would count as proof.
11 min read