TRAPPIST-1 Solar System Comparison. This diagram compares the TRAPPIST-1 planet system with Earth's solar system. The size of Earth's sun is shown with regard to the red dwarf star, TRAPPIST-1. The position of the seven planets around TRAPPIST-1 are shown in relation to Mercury's orbit around the sun.

TRAPPIST-1 Solar System Comparison. This diagram compares the TRAPPIST-1 planet system with Earth's solar system. The size of Earth's sun is shown with regard to the red dwarf star, TRAPPIST-1. The position of the seven planets around TRAPPIST-1 are shown in relation to Mercury's orbit around the sun.

Since entering Mercury orbit on March 17, 2011, NASA’s MESSENGER Spacecraft has provided astronomers with over 250,000 images and extensive other data sets.

Since entering Mercury orbit on March 17, 2011, NASA’s MESSENGER Spacecraft has provided astronomers with over 250,000 images and extensive other data sets.

John Glenn's Mercury mission was the first American space flight around the world. #Infographic

John Glenn's Mercury mission was the first American space flight around the world. #Infographic

Earth and Moon from Mercury orbit, with Moon entering eclipse.  Imaged on Wednesday, October 8, 2014 by MESSENGER, a spacecraft in orbit around Mercury.

Earth and Moon from Mercury orbit, with Moon entering eclipse. Imaged on Wednesday, October 8, 2014 by MESSENGER, a spacecraft in orbit around Mercury.

Mercury is the closest planet to the sun and has a thin atmosphere, no air pressure and an extremely high temperature.

Mercury is the closest planet to the sun and has a thin atmosphere, no air pressure and an extremely high temperature.

Every US space mission from Mercury to Apollo-Soyuz with astronauts color-coded by selection group.

Every US space mission from Mercury to Apollo-Soyuz with astronauts color-coded by selection group.

MESSENGER Completes Second Burn to Maintain Mercury Orbit by JASON MAJOR o9/22/14 Illustration of MESSENGER in orbit around Mercury (NASA/JPL/APL)

MESSENGER Completes Second Burn to Maintain Mercury Orbit by JASON MAJOR o9/22/14 Illustration of MESSENGER in orbit around Mercury (NASA/JPL/APL)

Our Solar System to Scale (I think this lesson could be easily modified for upper elementary science classes--and would make a great hook or culminating activity for a Solar System unit!)

Our Solar System to Scale (I think this lesson could be easily modified for upper elementary science classes--and would make a great hook or culminating activity for a Solar System unit!)

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