NASA, Earth and asteroid

The planet that the asteroid was once a part of contained a salty ocean. Scientists found 11 minerals in the samples, but more importantly, they found 14 out of 20 key building blocks for life -- at ...
Explorer 1 became the first successfully launched satellite by the United States when it was sent to space on 31 January 1958 ...
YR4 might force NASA to plan the first-ever space mission to push an asteroid away from Earth. Most likely, though, it's a non-threat.