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October 21, 2015

How viewing Earth as an exoplanet can help search for alien life

An extraterrestrial spacecraft lurking in a satellite's orbit near Earth would be able to see city lights and pollution in our atmosphere.

October 21, 2015

European space probe makes rendezvous with comet after decade-long chase

The European Space Agency says comet-chasing space probe Rosetta has reached its destination after a journey lasting more than a decade.

October 21, 2015

Cold dead star may be a giant diamond

Astronomers aren't being poetic when they say this star is a diamond.

October 21, 2015

Supernova seen through cosmic 'cigar smoke' by NASA telescope

A NASA space telescope captured an amazing view of a new supernova, seeing the star explosion through the cosmic smoke of the relatively nearby Cigar Galaxy.

October 21, 2015

Largest yellow star ever seen revealed in new light

A powerful telescope in Chile has imaged the largest yellow star ever discovered.

October 21, 2015

Energy ribbon at solar system's edge a 'cosmic roadmap'

A strange ribbon of energy and particles at the edge of the solar system first spotted by a NASA spacecraft appears to serve as a sort of "roadmap in the sky" for the interstellar magnetic field, scientists say.

October 21, 2015

Humanity will detect aliens by 2040, researcher says

Intelligent extraterrestrial beings are out there, and we’ll be meeting them shortly – perhaps within the next 25 years, according to one scientist.

October 21, 2015

The North Star Polaris is getting brighter

After dimming for the last few decades, the North Star is beginning to shine brightly again. And over the last two centuries, the brightening has become rather dramatic.

October 21, 2015

Hubble telescope captures images of galaxies from 13.2 billion years ago

The Hubble Space Telescope has peered back to a chaotic time 13. 2 billion years ago when never-before-seen galaxies were tiny, bright blue and full of stars bursting to life all over the place.

October 21, 2015

Last glimpse of Comet ISON before Thursday encounter with sun

A NASA probe orbiting Mercury has returned new photos of Comet ISON, and a number of other spacecraft are all set to document the icy wanderer's much-anticipated solar flyby on Thursday.