Why isn’t the universe as bright as it should be?
Study explains why galaxies don’t churn out as many stars as they should.
The universe in a cube
New model, spanning 13 billion years of cosmic evolution, makes important advances.
A “wimpy” dwarf fossil galaxy reveals new facts about early universe
Faintest galaxy ever detected illuminates unusual aspects of the universe’s early evolution.
Researchers discover that an exoplanet is Earth-like in mass and size
While too hot to support life, Kepler 78b is roughly the size of the Earth.
When the first stars blinked on
The very first stars may have turned on when the universe was 750 million years old.
Measuring the universe’s ‘exit door’
For the first time, an international team has measured the radius of a black hole.
A far-off solar system
Researchers measure the orientation of a multiplanet system and find it very similar to our own solar system.
An element that's rare on Earth is found far, far away
Tellurium detected for the first time in ancient stars.
3 Questions: Sara Seager on discovering a trove of new planets
NASA’s Kepler orbiting telescope has found hundreds of new possible planets, including 54 in the so-called 'habitable zone.'
Explained: Transiting exoplanets
How astronomers learn whether a planet is habitable by observing slight changes in light emanating from its parent star.