Journey through the cosmos and discover the wonders of our universe
In space, no one can hear you scream because there's no medium for sound to travel through. Sound waves need a medium like air or water to vibrate through.
The Sun accounts for 99.86% of the mass in our solar system. It's so large that approximately 1.3 million Earths could fit inside of it.
There are more stars in the universe than grains of sand on all the Earth's beaches. The observable universe contains about 70 sextillion stars.
Time moves slower near massive objects due to gravitational time dilation. GPS satellites have to account for this effect to maintain accuracy.
Space is extremely cold (about -270°C) but can also be extremely hot near stars. The temperature varies dramatically depending on location.
The universe is expanding at an accelerating rate. Galaxies are moving away from each other, and this expansion is getting faster over time.
Our closest star and the center of our solar system. Click to learn more.
The brightest star in the night sky. Click to learn more.
A massive red supergiant in Orion. Click to learn more.
The current North Star. Click to learn more.
One of the most recognizable constellations. Click to learn more.
Home to the Big Dipper. Click to learn more.
A stellar nursery in the Orion constellation. Click to learn more.
A supernova remnant with a pulsar at its center. Click to learn more.
A planetary nebula often called the \"Eye of God\". Click to learn more.
Iconic star-forming region in the Eagle Nebula. Click to learn more.
Our home galaxy. Click to learn more.
Our closest galactic neighbor. Click to learn more.
A galaxy that looks like a wide-brimmed hat. Click to learn more.
A beautiful interacting spiral galaxy. Click to learn more.
