... 75 solar masses to about 50% of the Sun and have a surface temperatures of less than 4,000 K. Red dwarfs are by far the most common type of star in the Milky Way, at least in the neighbourhood of the Sun, but due to their low luminosity, individual r ...

Artwork showing five common types of galaxy. Clockwise from top left these are: spiral, lenticular, barred spiral, elliptical and irregular. Elliptical galaxies are common, and contain mainly old stars. They also have relatively less gas and dust tha...

Artwork of a small meteoroid impacting the surface of the Moon. Impacts are much less common now than billions of years ago; yet they still occur, because the Moon has no atmosphere to slow down or destroy incoming missiles....

... seous, somewhat similar to the planet Neptune. Thousands of exoplanets are now known, but exomoons - although most certainly common - have mostly evaded discovery until now, because it presents a much more difficult challenge. ...

... seous, somewhat similar to the planet Neptune. Thousands of exoplanets are now known, but exomoons - although most certainly common - have mostly evaded discovery until now, because it presents a much more difficult challenge. ...

... seous, somewhat similar to the planet Neptune. Thousands of exoplanets are now known, but exomoons - although most certainly common - have mostly evaded discovery until now, because it presents a much more difficult challenge. ...

... seous, somewhat similar to the planet Neptune. Thousands of exoplanets are now known, but exomoons - although most certainly common - have mostly evaded discovery until now, because it presents a much more difficult challenge. ...

... seous, somewhat similar to the planet Neptune. Thousands of exoplanets are now known, but exomoons - although most certainly common - have mostly evaded discovery until now, because it presents a much more difficult challenge. ...