Black holes sometimes merge. But could 1 split into 2 or more? A new study explores the conditions that might allow it, including extremely rapid rotation.
New analysis shows that 2 possible marsquakes detected by Viking 2 were in the same region as nearly 1,000 others detected by the InSight lander decades later.
The November birthstone, topaz, comes in lots of colors. It's a much-loved gemstone in jewelry, with myths that date to ancient times. Or choose citrine.