The Helix Nebula is an example of a planetary nebula. Though it looks like a bubble or eye from Earth's point of view, the Helix is actually a trillion-mile-long tunnel of glowing gases.
"The KBC supervoid is a region that is about 20% less dense than the cosmic average, centered roughly where we are and extending out to about a billion light years," Banik said. "Typically, when ...
A composite image of the Crab Nebula features X-rays from Chandra (blue and white), optical data from Hubble ... Data sonification of the Milky Way galactic center, made using data from NASA's Chandra ...