January 30, 2019

What are black holes?

Astronomers can’t see these mighty munchers of matter, but they spot their effects across the galaxy. Black holes form when stars 20 times larger than our […]
January 30, 2019

What would happen if you got sucked into a black hole?

Some seriously strange stuff – and none of it good. Everything would go dark as your spaceship approached the black hole’s swirling ‘’event horizon,’’ or point […]
January 30, 2019

What is dark energy?

Until recently, astronomers assumed that gravity was slowing the expansion of the universe that began with the big bang. At the end of the last century, […]
January 30, 2019

What is dark matter?

The other 27 percent of the universe is made of this stuff, which is easier to detect than dark energy because astronomers can measure its gravitational […]