Choose the 50 most important space discoveries for our special feature in issue 50 of All About Space

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* 1. Which of the following space discoveries do you think are the most important? Rank them from 1 (most important) to 50 (least important). Use the drop-down menus or just drag them to re-order.

Galileo discovers the moons around Jupiter

Water on Mars

Ripples in space-time found

The universe is expanding

There are galaxies beyond the Milky Way

Enceladus shoots geysers

Discovery of the first pulsating star

We’re made of stardust

The first alien world is discovered

Dwarf planet Ceres is found in the asteroid belt

The universe’s first stars

A galaxy straight after the Big Bang

The Earth has a magnetic field

Finding a way to throw spacecraft into orbit around planets

Discovery of the first supermassive black hole

There are active volcanoes on the surface of another world

Discovery of Pluto

Our galaxy is a spiral shape

Discovery of the most Earth-like planet

Part of the universe is missing

The early Solar System was bombarded with thousands of space rocks

Stars are powered by fusion

Ice giant Neptune is found

The Earth is round

The universe is 13.8 billion years old

Stars make radio waves

There are magnetic space bubbles beyond the Solar System

Radiation that proves the Big Bang

The Sun has a fiery solar wind

The heaviest stars in the universe explode

Discovery of the heaviest dwarf planet in the Solar System Eris

Europa has an underground ocean

Rings are discovered around Saturn

The crater that points to the extinction of the dinosaurs

The universe is dying

The discovery of space magnifying glasses

There are lakes and seas on Titan

How the Moon was made

A baby planet in the process of forming

There is abundant water ice on Pluto

Discovery of cosmic neutrinos

Discovery of the Higgs Boson

Rockets work in a vacuum

The very first object beyond the orbit of Pluto

The first galaxy with jets

The discovery of Halley’s Comet

Finding out what space objects are made of

Discovery of Uranus

Stars can orbit black holes

Stars explode with gamma rays

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