Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
Taken from an altitude of 18,000 km by an automatic camera aboard Apollo 4
Photo by ESA astronaut Alexander Gerst
Astrophotographer Bartosz Wojczyński created this fascinating timelapse of the Earth’s rotation
I love how elegantly a simple visualization can explain concepts like these
But of course
Airborne particles like sea spray, smoke, and dust, visualized.
Featuring: Justin Bieber, Ariana Grande, Halsey, Zac Brown, Brendon Urie, Hailee Steinfeld, Wiz Khalifa, Snoop Dogg, Kevin Hart, Adam Levine, Shawn Mendes, Charlie Puth, SIA, Miley Cyrus, Lil Jon, Rita Ora, Miguel, Katy Perry, Lil Yachty, Ed Sheeran, Meghan Trainor, Joel Embiid, Tory Lanez, John Legend, Backstreet Boys, Bad Bunny, Psy, and Kris Wu
A 4K timelapse tour of Earth as seen by astronauts onboard the ISS
Okay two words, Holy Crap