May 6, 2015; 7:08 PM ET
After the midweek’s above-average temperatures and stormy pattern, a cooler but drier pattern picks up for the end of the week and beginning of the weekend. more >
What happens when you make a low-level flyby of a cometary nucleus? You get jaw-dropping images.
As the famous telescope turns 25, scientists who have worked on the project chose their favorite pictures.
Our Sun missed the stellar "baby boom" that erupted in our young Milky Way galaxy 10 billion years ago. During that time the Milky Way was churning out stars 30 times faster than it does today.