The first total solar eclipse to sweep across the entire US since 1918 is happening on August 21, 2017. The eclipse center line will enter the US crossing Oregon between Lincoln City and Newport and will exit three hours later in South Carolina between Georgetown and Charleston. If you've never seen a total solar eclipse, here's your chance! NASA is here to help you prepare for this wondrous natural spectacle.
Earth's magnetic poles reverse their geographic locations every 300,000 years. The last event happened 780,000 years ago.