Learn the difference between meteoroids, meteors, meteorites, comets, and asteroids.
Astronomy
Find out which element is the most abundant element in the universe. See the abundance of other elements, too.
What Is the Most Abundant Element in the Universe?
One easy way to calculate your weight on other planets is to multiply your weight on Earth by the ratio between gravity on another planet and Earth.
How to Calculate Weight on Other Planets
The moon rotates, completing one rotation each month so we only see one side.
Does the Moon Rotate on Its Axis?
The light year (ly) is a unit of length that is the distance light travels in a vacuum in one Earth year. One light year is approximately 9.46 trillion kilometers (9.46 x 1012 km) or 5.88 trillion miles (5.88 x 1012 mi). The light year is used to describe distances to stars without having to use very […]
What Is a Light Year? Definition and Examples
It never gets truly dark at night because of an effect called airglow. Airglow is similar in color to the aurora, but you don’t have to visit a polar region to see it. While the aurora is light released by the interaction between magnetosphere and the solar wind, airglow is […]