It’s hard to imagine just how large something is in a fictional universe until it’s been compared to a reference; either one from reality, or another fictional universe. And we know this, undoubtedly, ...

This illustration shows the average brown dwarf is much smaller than our sun and low mass stars and only slightly larger than the planet Jupiter. Disclaimer: AAAS and EurekAlert! are not responsible ...

Astronomers studying extreme planetary systems have identified worlds so massive that they rival the smallest stars in size.

I first heard about the genre of “size comparison” videos on YouTube from this article in the New York Times, written by a mom whose seven-year-old son had become obsessed with them. He’s at a ...

What does a lead nucleus and a neutron star have in common? When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Scientists have made new estimates of ...