On this date in 1672, Giovanni Cassini discovered Saturn's moon Rhea.
Rhea is the second largest of Saturn's many moons.
On this date in 1672, Giovanni Cassini discovered Saturn's moon Rhea.
Rhea is the second largest of Saturn's many moons.
The Pentagon's new UFO office has received several hundred reports from military personnel in its first six months.
According to the office, none of the incidents suggests alien activity.
Astronomers have found two large exoplanets orbiting the same star 218 light years away, and both seem to be water worlds.
They could be larger versions of Europa.
A new study suggests mammals were already on the ascent before the big dinosaurs went extinct.
The killer asteroid simply opened the field.
The Soyuz attached to ISS has suffered a massive leak, likely making it unusable.
If that's correct, in an emergency the entire ISS crew could not currently be evacuated.