Measuring dark energy has always relied on supernovas. Find out about a more accurate technique and how it sheds light on this and other mysteries. (4:30 read time)
When we measure the rate at which the universe expands, our two answers don't match. One scientist says its because we're in a Hubble Bubble. Find out more. (4:00 min read)
Find out how researchers at Princeton are pinning down how fast our universe is expanding using gravitation waves.