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Why are the sun and moon the same size in the sky?

Space

Why are the sun and moon the same size in the sky?

The sun is about 400 times as wide as the moon, but it is also 400 times further away. The two therefore look the same size in the sky – is it more than a coincidence?

Features

Review: <i>The Hunt for Planet X</i> by Govert Schilling

Space

Review: The Hunt for Planet X by Govert Schilling

Books & Arts

Space

Apollo 17 sample helps date Moon

News

What people thought about Pluto's demotion

Space

What people thought about Pluto's demotion

News

Did the Moon's far side once face Earth?

Space

Did the Moon's far side once face Earth?

News

Review: <i>The Pluto Files</i> by Neil deGrasse Tyson

Space

Review: The Pluto Files by Neil deGrasse Tyson

Books & Arts

Methane pockets may narrow search for Mars life

Life

Methane pockets may narrow search for Mars life

News

Were Mercury and Mars separated at birth?

Space

Were Mercury and Mars separated at birth?

News

Space

Angry Sun could spell disaster on Earth

News

Gallery: Twin rovers celebrate five years on Mars

Space

Gallery: Twin rovers celebrate five years on Mars

This month, NASA's plucky rovers are celebrating their fifth anniversary on the Red Planet - relive their highs and lows in this gallery

News

Space

What has been moving rocks on Mars?

News

Space

Danger ahead as the Sun goes quiet

News

Space

2008: The year in the solar system

News

Space

Mars rovers reach fifth anniversary

News