Learn about an annular solar eclipse or ring of fire eclipse. See how it works, how to view it safely, and when upcoming eclipses occur.
Astronomy
Discover what a solar flare is, how it works, and what its effects are on Earth and space. Get examples of large solar flares.
What Is a Solar Flare?
Learn whether Pluto is a planet and understand the differences between planets and dwarf planets. See what Pluto has in common with comets.
Is Pluto a Planet?
Learn the reasons why space is black and how scientists resolve Olber's paradox about how we don't see a sky full of stars.
Why Is Space Black? Olber’s Paradox and the Cosmic Night ...
Get Oort Cloud facts. Learn about its location and size, the objects it may contain, and how scientists study it.
Oort Cloud Facts and Location
Learn what dark matter is. See the evidence for its existence and learn about research aimed at exploring its nature and properties.
What Is Dark Matter?
Learn about the Drake equation and how it estimates the odds of finding intelligent extraterrestrial life. See the range of values.
Drake Equation – Odds of Finding Intelligent Extraterrestrials
Learn how old the universe is and how we know its age. Learn about two methods cosmologists use in determining time since the Big Bang.
How Old Is the Universe? How Do We Know?
Get total solar eclipse facts, including a list of upcoming total eclipses, the stages of the eclipse, and special features to see.