请调整浏览器窗口大小或者请使用手机查看!
Earth's history is marked by one cosmic disaster after another, forging the path of human evolution; now, experts explore how the Earth has teetered on the verge of destruction.
Dark Matter is thought to be the cosmic glue that holds the universe together, yet the search for it continues to elude scientists today.
Determining the age of the universe continues to be an elusive endeavor for scientists as their results are conflicting. Without a definitive answer, everything known about the cosmos could be completely wrong.