Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Planets will gather and form a dazzling arc in the night sky that will be visible across ... both will appear as just tiny bits of light. During the planetary alignment, viewers should go ...

the human body knows when to sleep and when to wake up when day changes into night and night changes into day. But what if that doesn't happen? Scientists say there are billions of such planets in ...