All 17 records found.
Huge, towering clouds build up in the sky—it's a super cell. The Doppler radar indicates that the system is rotating. But is there a funnel? Is it touching the ground? Only a storm chaser can… Read More →
Could life have previously flourished on Mars? Will humans be able to travel there one day? Can humans one day colonize the red planet? NASA scientists have been interested in answering… Read More →
In the sixth century B.C.E., the Greek philosopher Anaximander theorized that Earth was at the center of the cosmos. That idea became ingrained in scientific thinking and Christian religious… Read More →
At one time or another, just about everyone has talked about the end of the world. But what does this phrase really mean? Does it mean the end of the human race? The end of planet Earth? The… Read More →
From the Series Seven Wonders
Uncover seven wonders of the four rocky planets. From Mercury, we'll watch the Sun appear to perform wild acrobatics. We'll also explore Venus, a planet full of puzzles and beauty. On Mars… Read More →