Remember that asteroid that isn't going to hit Earth? We could send a mission to explore it
YR4, which orbits the sun every four years and periodically crosses Earth's orbit. The nature of its orbit makes it a ...
The New York Times21h
Space and Astronomy
Much of the understanding of the seventh planet comes from a brief flyby nearly 40 years ago ... This event is linked to Halley’s comet, and occurs as another comet, Tsuchinshan-ATLAS, remains ...