Caloris Basin


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Caloris Basin

(kă-lor -iss) See Mercury.

Caloris Basin

[kə′lȯr·əs ′bā·sən]
(astronomy)
A large depression on Mercury, about 1300 kilometers in diameter.
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Another topographic oddity involves the giant, 1,000-mile-wide Caloris Basin, Mercury's largest impact feature.
Dr Rothery drew particular attention to a pale-coloured patch on the floor of the Caloris Basin, which, he explained, appeared to be young and smooth.
For instance, the ancient Caloris Basin is filled with smooth plains that appear to have been created by the belching of vast amounts of lava.
For instance, the ancient Caloris Basin, big enough to hold Arizona, Nevada and California, is filled with smooth plains that appear to have been created by the belching of vast amounts of lava.
He reviewed the past work of the Mercury and Venus Section, and showed that the albedo details captured by the spacecraft, in particular the Caloris basin, agreed well with drawings and images by Section members and by Schiaparelli and Antoniadi.
And the biggest crater on Mercury--the one most likely to reveal how this planet came to be--is Caloris basin.
The entire structure lies within another huge crater called the Caloris basin.
Recorded with 11 color filters, the images show that the giant Caloris basin, the largest crater on Mercury and one of the biggest in the entire solar system, has a diameter of about 1,500 km.
Note the light color of the big, round Caloris Basin (upper right) and the unusual dark-rimmed craters within it.
Some researchers concluded that Mercury's thin atmosphere of sodium and potassium may have formed from material that diffused up through fractures in the planet's crust rather than from meteorite impacts, judging from spectral measurements showing that more of these elements seemed to be present when a huge surface feature called Caloris Basin was in view (136: 311).