Reference Learn about the Big Bang theory and the evolution of the universe in ten steps.
Here are some before-and-after satellite images of Texas that show the devastation caused by Harvey.
Pesky clouds threatened to spoil the view for tens of thousands of people who journeyed from near and far to this southern Illinois college town to witness the Great American Solar Eclipse.
A newly released composite photo of the total solar eclipse shows the entire celestial event as it unfolded over Oregon.
Here are some of the coolest photos from in and around Carbondale, a city along the path of totality for the August 2017 solar eclipse.
When it comes to total solar eclipses, "X" marks the spot for this college town, and excitement is building as people gear up for what's being heralded as the "Great American Solar Eclipse."
Hurricane Joaquin, a Category 4 storm that is currently battering the central Bahamas, appears to be replacing its eye, according to weather forecasters.
The first total lunar eclipse of 2014 will occur overnight tonight, marking the start of an eclipse tetrad — four back-to-back total lunar eclipses — that will happen over the next 18 months.
New satellite photos reveal the astonishing damage from a deadly landslide that swept through the small town of Oso, Wash., earlier this month.
More possible debris from the missing Malaysian Airlines jet that is thought to have crashed in the Indian Ocean earlier this month was spotted by Thai satellites, according to search officials.
The northern lights dance across the sky, creating an ethereal glow that illuminates the darkness, in this jaw-dropping photo taken from Norway.
Giant wind turbines appear as white specks across the Thames Estuary in the United Kingdom, in this satellite photo of the London Array, the world's largest offshore wind farm.
The pristine night sky — chock full of gleaming stars and awe-inspiring views of our Milky Way galaxy — comes to life in a magnificent time-lapse video shot from northern Chile.
Five rocky planets are among a slew of newly discovered alien worlds found by NASA's prolific Kepler spacecraft.