Space and Universe

A  natural satellite  or  moon  is, in the most common usage, an  astronomical body  that  orbits  a  planet  or  minor planet  (or someti...

What is Mars like? Mars is a cold desert world. It is half the size of Earth. Mars is sometimes called the Red Planet. It's red beca...

Earth won't always be fit for occupation. We know that in two billion years or so, an expanding sun will boil away our oceans, leaving...

The Milky Way Galaxy The band of the Milky Way  galaxy  can be seen at night in areas with dark skies. Here it is seen with several Ata...

When astronauts return from space walks and remove their helmets, they are welcomed back with  a peculiar smell . An odor that is distinct ...

Dark matter  is a  hypothetical  form of  matter that is thought to account for approximately 85% of the matter in the  universe  and abou...