Get the facts on this planet of extremes. Orbiting the Sun at a distance of 4.5 billion kilometres - more than 30 times further out than the Earth - Neptune is a dark, icy world. Receiving just one ...

They also weigh about the same, with Neptune coming in at 1.024 x 10^26 kg (about 17 times the mass of Earth) and Uranus weighing 8.682 x 10^25 kg (about 14 times the mass of Earth). What's more ...

"Based on our predictions, up to about 1% of super-Earth and mini-Neptune systems could host Earth-like planets within the habitable zone of their stars. While this fraction is relatively low ...