Space
- Planets
Scientists Say: Eclipse
How the sun, moon and Earth line up determines whether there’s a solar or lunar eclipse.
- Space
Cosmic mystery: Why are many galaxies dark?
Dark galaxies went unnoticed until 2015. Since then, scientists have now found more than 1,000 — and there may be many, many more.
- Planets
How Earth got its moon
How did our moon form? Scientists are still debating the answer. It may be the result of some one big impact with Earth — or perhaps many small ones.
- Planets
Analyze This: The masses of planets
Scientists discovered a solar system with planets that are similar in size and mass to Earth. Using data, we take a closer look at that similarity.
- Science & Society
Will we know alien life when we see it?
The hunt is on for extraterrestrials. But recognizing them may require some wiggle room in what we define as being alive.
- Earth
Keeping space missions from infecting Earth and other worlds
Scientists are always looking for ways to stop Earthly microbes from polluting other planets. The same goes for bringing bits of other planets back to Earth.
- Science & Society
Cool Jobs: Reaching out to E.T. is a numbers game
From figuring out if we’re alone in the universe, to writing messages to aliens, scientists use math in many ways in their search for extraterrestrial intelligence.
- Science & Society
Should we call out to space aliens?
Scientists have been listening to space for decades, hoping to pick up alien signals. Now some have proposed we try broadcasting a welcome call.
- Planets
Scientists Say: Dwarf planet
Dwarf planets are distinct from the full-size models. A little too small, they also have a lot of space stuff filling their path around the sun.
- Physics
Star caught passing gas before exploding
Stars can become unstable as they near death, a new study suggests. Some may even spew gas for a year or so before they explode.
- Space
Student programs computer to predict path of space trash
People are already using space as a garbage dump, which could prove dangerous to future space travelers. A teen set out to track space junk using only her home computer.
- Health & Medicine
Hibernation: Secrets of the big sleep
Mammals from bears to squirrels hibernate the winter away. Learning how they do it might one day help people mimic aspects of it to heal from brain injuries or voyage to Mars.
