Stargazers could catch a glimpse of a partial solar eclipse this weekend, where the sun looks like it's had a bite taken out of it. It only occurs a handful of times a year, when the moon passes ...

The eclipse was visible Saturday across Europe, western Africa, eastern North America and northern Asia. During a partial ...

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time ...