Gravitational waves can be lensed by massive galaxies so that they repeat, like an echo. Scientists are now readying to snare their first one and explore the cosmic secrets it holds

Galaxies could do with a few more arms or some decorative designs – on this episode of Dead Planets Society, our hosts are using collisions, black holes and dark matter to reshape our galaxy

A white dwarf star orbiting a sun-like star was thought to be impossibly small, but now astronomers have found another star in the system that solves the puzzle

A rare geomagnetic storm not seen for nearly 20 years could cause a stunning aurora borealis on 10 and 11 May

Sufficiently advanced aliens would be able to capture vast quantities of energy from their star using a massive structure called a Dyson sphere. Such a device would give off an infrared heat signature - and astronomers have just spotted 60 stars that seem to match

Surprising recent measurements hint that the universe isn’t expanding in the way we had thought, and it could be explained by still-theoretical dark radiation