Construction starts on the world's largest optical telescope
The Extremely Large Telescope has been years in the making.
Live look at the 'alien megastructure' star may solve mysteries
It's a rare chance to look at the star's strange behavior while it's happening.
Most habitable planets may be completely covered in water
Simulations suggest that Earth's ideal mix of land and sea is rare.
Nearby 'super-Earth' may be our best shot yet at finding alien life
LHS 1140b is in just the right orbit for atmospheric studies.
One of Jupiter's asteroid 'moons' is orbiting backwards
It's defying all expectations.
NASA is crowdsourcing the search for exoplanets
Your eyeballs can spot planets far better than algorithms.
Dwarf star's atmosphere holds the ingredients for life
It hints that the conditions for life could be more common than you think.
Gamma ray telescope spots ancient, intense black holes
It also helped detect 'hidden' rays from the Sun.
Scientists discover a cosmic-scale particle accelerator
Entire galaxy clusters have been swept up in this phenomenon.