January 23, 2019

Why is the sun so bright?

It’s a big ball of gas accounting for 99.8 percent of the total mass of the solar system. More than a million Earths would fit inside […]
January 23, 2019

Why is sunlight good for me?

A sunny day can do more than just raise your spirits – it can make you healthier! Your body converts sunlight into vitamin D, a vital […]
January 23, 2019

Why is sunlight bad for me?

A little bit of sun goes a long way. Sunlight contains invisible ultraviolet (UV) rays that can damage your skin, causing it to burn or wrinkle, […]
January 24, 2019

How do we know what the Milky Way looks like?

Actually, we don’t know for sure – no more than a bacteria deep inside your belly knows your hair color or shoe size. But unlike bacteria, […]