"We do at some point need to be a multiplanet civilization, because Earth will be incinerated." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

People always want to know what will happen to Earth when the sun eventually swells up as a red giant. For one thing, the expanding sun will turn the inner planets into cinders. It will almost ...

Our Sun, that steady burning ball of gas that has faithfully illuminated Earth for billions of years, is slowly but relentlessly growing brighter. This might sound like good news, but it's actually ...

Elon Musk is taking the long view. The billionaire SpaceX founder has long said that humanity needs to expand its footprint out into the solar system — specifically to Mars, which is the most suitable ...