Temperatures in the Sun's core exceed 10 million degrees Celsius. But how on Earth did we actually come to know that?
Asteroid collisions aren't always bad.
Cyanea pohaku, the extinction of which can be traced to human interventions in the environment, was gone before we had a chance to really study it.
Finding a tiny planet around bright stars dozens or hundreds of light-years from Earth is extremely difficult.
Chemical changes inside Mars's core caused it to lose its magnetic field. This, in turn, caused it to lose its oceans. But how?
The outer planets’ clouds hide the weirdness within.