* China opens international call for instruments on Tianwen-3 Mars mission by Riko Seibo..
* Despite a last-minute challenge of having to pay a U.S. tariff to get..
* File: A Falcon 9 rocket stands in the launch position at Space Launch..
* Astronomers have found a new way of accurately mapping the outer gas disk..
* A remote outcrop in Canada harbors rocks that are at least 4.16 billion..
* The Andromeda galaxy, also known as Messier 31 (M31), is the closest spiral..
* Editor’s Note: This advisory was updated Thursday, June 26, to note that the..
* North American observers have a shot at seeing a sub-24-hour-old Moon on Wednesday..
* Saturn and Neptune will share the same right ascension, with Saturn passing 59'..