This figure might sound a lot, but it is actually quite a bit smaller than previous estimates had suggested.
Astrophysicist Michael Garrett takes a look at what inquisitive aliens might be able to find out by observing our planet.
The space agency has stressed that there may be very little warning that a disruptive solar storm is about to hit the Earth.
China's answer to the X-37B has returned to Earth once again after nearly a year of unspecified activities in space.
A new study has aimed to determine whether Earth's radio and mobile tower signals could be picked up from other worlds.
A response to signals sent by some of our own spacecraft could reach Earth before the decade is out, scientists say.
Gold is a valuable and highly coveted resource - but just how much of the Earth's supply have we found so far ?
Scientists in Japan have found new evidence to suggest that the building blocks of life arrived on Earth from space.
Our cities are getting larger all the time, but is it really plausible for them to ever cover the entire planet ?
A meteor from another solar system landed on Earth back in 2014, but obtaining more information about it has proven challenging.
The image of an alleged Bigfoot found on Google's satellite mapping service has been dividing opinion this week.
The space rock passed us by at a distance of 2,200 miles - a fraction of the distance at which some satellites orbit the Earth.
An intriguing geological phenomenon at the center of our planet could help to explain a number of long-standing mysteries.
Archaeologists excavating a car park off the coast of Northumberland, England have unearthed seven skeletons.
The newly discovered world, which is 41 light-years away, is almost exactly the same size as the Earth.
Some minerals can be found almost anywhere, while others are so rare that there is only one known example.
A new paper has put forward a new theory to explain why we have yet to hear from any extraterrestrial civilizations.
A 17-ton meteorite that landed in Somalia has been found to contain two minerals never seen on Earth before.
The end of the spacecraft's current mission was marked by a series of sonic booms over Florida on Saturday.
Situated in our 'cosmic backyard', this newly discovered behemoth is ten times more massive than the Sun.