Saturday night, Mars will appear to be the brightest it's been in more than 10 years.
The red planet will be within 48 million miles of Earth from May 21 until June 12. The last time it was this close was in November 2005.
Mars passes close enough to Earth to be seen every other year. It's called Mars opposition because the planet appears to be directly opposite of the sun, near the moon in the sky.
The Hubble Space Telescope has already taken advantage of Mars' proximity and snapped a new photo that shows the planet's frosty polar caps and cloudy skies.
This isn't the closest Mars has ever been to Earth. In 2003, it was under 35 million miles away. It will pass by Earth at about that range again in July 2018.
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