Astronomers see cavities - like giant bubbles - in hot gas around galaxy cluster NGC 5813, caused by multiple eruptions over millions of years of a black hole.
Although we can't see it from the outside, astronomers know our galaxy has an overall spiral structure. For years, they've been trying to pin down the number of Milky Way spiral arms. Now they say ... 4.
As the New Horizons spacecraft speeds closer to its July flight through the Pluto system, we're seeing an increasingly complex surface. Best views yet.
An astronaut aboard the ISS prepares one of her favorite meals - quinoa salad with tomato, mackerel and leek cream in a warm tortilla. Here's how it's done in space.