The ISS has been operational for well over two decades, but its days are numbered. Here's what the plan for human habitation ...

China has conducted two spacewalks from its Tiangong space station in as many months and is advancing on its lunar ...

Despite being known as the Red Planet, Mars shows off its swirling yellows, oranges and browns in a new satellite photo from ...

Why is Mars barren and uninhabitable, while life has always thrived here on our relatively similar planet Earth?