Click anywhere on this site, and you’ll likely run into a measurement in terms of light-years, solar masses, astronomical units, or arcminutes. These units are unique to astronomy, and all can be ...

Scientists still define astronomical time in years, with some recent refinements. By C. Claiborne Ray Q. Do scientists actually speak of the age of the universe in years, or do they use some ...

Earth's distance from the sun does not stay the same throughout the year. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking space news, ...