Latest Articles
Europa vs Enceladus: Which Ocean Moon Is More Likely to Harbor Life?
Two moons in our solar system have confirmed liquid water oceans beneath their icy surfaces. Both are geologically active. Both have been touched by spacecraft. And both are now central to the question of whether life exists anywhere beyond Earth. The question of which ocean moon is the better candidate for life — Europa or…
Titan: Saturn’s Strange Moon and the Most Earthlike World in the Solar System
If you could stand on Titan and look up, you would see a thick orange haze blocking all but a faint glow from the distant Sun. The air pressure around you would be about 1.5 times that of Earth at sea level (comfortable, in a sense), but the temperature would be around −179°C (−290°F), cold…
Cosmic Inflation Explained: The Universe’s First Trillionth of a Trillionth of a Second
The Big Bang model describes the universe expanding from a hot, dense state. But when cosmologists trace that expansion backward, they run into problems, not with the physics, but with what the physics implies about the universe we observe today. The cosmos is too smooth, too flat, and too uniform at large scales for a…
Antimatter Explained: The Mirror Image of Matter and Why the Universe Exists
Every particle of matter has an antimatter twin, identical in mass, opposite in charge and certain other quantum properties. When matter and antimatter meet, they annihilate each other completely, converting all of their mass into pure energy. This is not science fiction. Antimatter is real, it has been produced and studied in laboratories for decades,…
What Is Spacetime? Einstein’s Unified View of Space and Time
Before Albert Einstein, space and time were considered separate and independent stages on which events took place. Space was the three-dimensional arena (width, height, depth), and time was a universal clock ticking at the same rate for everyone, everywhere. Newton’s physics assumed this. It was so obvious that no one had questioned it seriously. The…
Genetic Drift Explained: The Random Force Shaping Evolution
Evolution is not only driven by survival of the fittest. Much of what happens to genes over time is the result of chance, random fluctuations in which individuals happen to survive and reproduce in any given generation. This process is called genetic drift, and it can be just as powerful as natural selection in shaping…
