A black hole in the center of the M87 galaxy in the constellation Virgo, which is 50 million light-years away, has been calculated to have a mass equal to that of 3 billion Suns!

Located less than 32 light-years from Earth, AU Microscopii is among the youngest planetary systems ever observed by astronomers.

A light-year is a unit of distance. It is the distance that light can travel in one year.

The parsec is equal to about 3.3 light-years.

The planet Sakura is 4.7 light-years away.

The size of a galaxy may be as little as a thousand light-years across or as much as a million light-years across.

The spiral galaxy NGC 3344 is located about 20 million light-years away.

Sirius is a binary star system and is about 8.6 light-years distant from our sun.

Hubble made one of the first visible-light images of an extrasolar planet circling the nearby, bright star Fomalhaut, located 25 light-years from Earth.

Out of all the exoplanets found by Kepler, this distant world – located 300 light-years from Earth – is most similar to Earth in size and estimated temperature.