➀ The Leonid meteor shower is set to peak this weekend, with meteors traveling up to 44 miles per second; ➁ The viewing conditions will be affected by a nearly full moon, but early morning hours can improve chances of seeing more meteors; ➂ The Leonids are derived from the parent comet, Comet Tempel-Tuttle, and were first discovered in 1865.

➀ Researchers suggest Earth had a ring system 466 million years ago; ➁ The hypothesis is based on the positions of asteroid impact craters; ➂ The ring may have contributed to the global cooling event known as the Hirnantian Icehouse.