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File:Mars, Earth size comparison.jpg. Size of this preview: 800 × 521 pixels. Other resolutions: 320 × 208 pixels | 640 × 417 pixels | 1,024 × 667 pixels | 1,280 × 833 pixels | 2,399 × 1,562 pixels. Original file (2,399 × 1,562 pixels, file size: 2.59 MB, MIME type: image/jpeg) Wikimedia Commons Commons is a freely licensed media ...
The atmosphere of Mars is colder than Earth’s owing to the larger distance from the Sun, receiving less solar energy and has a lower effective temperature, which is about 210 K (−63 °C; −82 °F). [2] The average surface emission temperature of Mars is just 215 K (−58 °C; −73 °F), which is comparable to inland Antarctica.
Its orbit is so low that its angular diameter, as seen by an observer on Mars, varies visibly with its position in the sky. Seen at the horizon, Phobos is about 0.14° wide; at zenith, it is 0.20°, one-third as wide as the full Moon as seen from Earth. By comparison, the Sun has an apparent size of about 0.35° in the Martian sky.
Mars is the fourth planet from the Sun. The surface of Mars is orange-red because it is covered in iron (III) oxide dust, giving it the nickname " the Red Planet ". [21] [22] Mars is among the brightest objects in Earth's sky, and its high-contrast albedo features have made it a common subject for telescope viewing. It is classified as a terrestrial planet and is the second smallest of the ...
File:Comparing the size of Earth, Mars, and exoplanets of Kepler-20 and Kepler-42.jpg
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The globally-average radius of Earth, generally given as 6,371 kilometres (3,959 miles), is often employed as a unit of measure to intuitively compare objects of planetary size. Lunar distance [ edit ]
It has attracted sustained study from planetologists and climatologists. While Mars's climate has similarities to Earth's, including periodic ice ages, there are also important differences, such as much lower thermal inertia. Mars' atmosphere has a scale height of approximately 11 km (36,000 ft), 60% greater than that on Earth.