Astronomy Picture of the Day
    


Mars at Closest Approach 2016
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Credit & Copyright: Jesăs Santos Garz└s
Explanation: When does Mars appear the largest? This occurs when Earth sweeps past Mars in their respective orbits around the Sun, creating a momentary Sun-Earth-Mars alignment called opposition. The featured video shows the Mars opposition that occurred earlier this year. All of the images were taken from Earth with a small telescope. Mars actually changes its size continuously -- the monthly jumps in size are an editing effect. During the first month in video, March, Earth's view toward Mars is from relatively far away and from a relatively sideways angle -- making Mars appear small and at less than full phase (gibbous). As months progress, Mars appears increasingly larger and fuller. The day Earth and Mars were closest together -- opposition -- was on May 22. By June, Earth had passed Mars, and part of the other side of Mars appeared shadowed. Mars will now appear increasingly smaller during 2016. Even if you watch Mars from Earth all along its orbit, though, Mars will never show a crescent phase.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: Mars - Earth
Publications with words: Mars - Earth
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