Time runs measurably slower near a black hole.

On Venus, a single day lasts longer than its entire year.

Venus

One teaspoon of neutron-star material would weigh roughly a billion tons on Earth.

Neutron star

There may be more stars in the observable universe than grains of sand on all of Earth's beaches.

Observable universe

Saturn is less dense than water.

Saturn

The light you see from the Andromeda Galaxy began its journey roughly 2.5 million years ago.

Andromeda Galaxy (M31)

Time runs measurably slower near a black hole.

Black holes

The Moon drifts about 3.8 centimetres further from Earth every year.

The Moon

The Sun holds about 99.86% of all the mass in the Solar System.

The Sun

Jupiter's Great Red Spot is a storm that has been observed for well over a century.

Jupiter

Voyager 1 is the most distant human-made object, now in interstellar space.

Voyager 1

Astronomers have now confirmed more than 5,000 planets orbiting other stars.

Exoplanets

Sound cannot travel through the vacuum of space, but it can travel through a galaxy cluster.

Perseus galaxy cluster

Mars hosts Olympus Mons, the tallest volcano in the Solar System.

Olympus Mons

The afterglow of the Big Bang fills the entire sky in microwaves.

Cosmic microwave background

The International Space Station circles Earth roughly every 90 minutes.

International Space Station

A supermassive black hole of about 4 million solar masses sits at the centre of our galaxy.

Sagittarius A*

Mercury swings between roughly 430 °C in daylight and −180 °C at night.

Mercury

Saturn's moon Titan has rivers, lakes and rain — made of liquid methane.

Titan

A light-year measures distance, not time — about 9.46 trillion kilometres.

Light-year

Betelgeuse is so large that, placed at the Sun's position, it would swallow the orbit of Mars.

Betelgeuse