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Photo: It’s a bird, it’s a plane…nope! It’s the International Space Station as it passed between the Earth and sun, seen here in 10 combined images. Take a closer look: http://go.nasa.gov/2hQWrgy

Photo: It’s a bird, it’s a plane…nope! It’s the International Space Station as it passed between the Earth and sun, seen here in 10 combined images. Take a closer look: http://go.nasa.gov/2hQWrgy

Kepler-186f ~ The first known Earth-size planet to lie within the habitable zone of a star beyond the Sun.

Kepler-186f ~ The first known Earth-size planet to lie within the habitable zone of a star beyond the Sun.

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The real size of the sun…

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Triton's Surface. This color photo of Neptune's large satellite Triton was obtained on Aug. 24 1989 at a range of 530,000 kilometers (330,000 miles). The resolution is about 10 kilometers (6.2 miles), sufficient to begin to show topographic detail. Credit: NASA

Triton's Surface. This color photo of Neptune's large satellite Triton was obtained on Aug. 24 1989 at a range of 530,000 kilometers (330,000 miles). The resolution is about 10 kilometers (6.2 miles), sufficient to begin to show topographic detail. Credit: NASA

Mercury is the closest planet to our Sun, but oddly enough, not the hottest. Since Mercury has no atmosphere, more of the Sun's heat radiates away from it whereas Venus, even though it's further away from the sun, has a thick greenhouse atmosphere trapping and retaining the Sun's heat and making it hotter.

Mercury is the closest planet to our Sun, but oddly enough, not the hottest. Since Mercury has no atmosphere, more of the Sun's heat radiates away from it whereas Venus, even though it's further away from the sun, has a thick greenhouse atmosphere trapping and retaining the Sun's heat and making it hotter.

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