On April 30, 2015, NASA's MESSENGER mission came to an end when the spacecraft intentionally crashed into the surface of Mercury. See how it happened in our On This Day In Space video series.
Pulsars are rapidly rotating neutron stars and sometimes they abruptly increase their rotation rate. This sudden change of spin rate is called a "glitch" and I was part of a team that recorded one happening in the Vela Pulsar.
Alien civilizations with technology levels similar to that of Earth could be visible with current instruments, if they've hoisted enough satellites into orbit, a new study suggests.
If aliens reach out to us, what would happen first? Researchers at the Search for Extraterrestrial Intelligence (SETI) Institute talk about the protocols in place for first contact.
German mathematician Johann Carl Friedrich Gauss used math to find the lost dwarf planet Ceres, and a Google Doodle commemorates what would have been his 241st birthday.