Two mathematicians now say they’ve made progress on a very old unsolved math problem. The problem involves a subfield called geometric measure theory, in which sets of objects are generalized in an ...

A 125-page proof posted to arXiv may represent a huge breakthrough in geometric measure theory. This problem has implications ...

For example, when light from one galaxy bends around another galaxy or a cluster of galaxies. When the curved object and the curving object line up, the result is a shape called an Einstein ring. Such ...

The type depends on how the three moving objects line up. If it is not in a perfect line, a partial eclipse occurs. If it is a perfect line, the sun is completely blocked and a total eclipse occurs.