by APOD Robot » Mon Nov 11, 2019 5:06 am
Lunar Craters Langrenus and Petavius
Explanation: The history of the Moon is partly written in its craters. Pictured here is a lunar panorama taken from Earth featuring the large craters
Langrenus, toward the left, and
Petavius, toward the right. The craters formed in separate
impacts.
Langrenus spans about 130 km, has a terraced rim, and sports a central peak rising about 3 km.
Petavius is slightly larger with a 180 km diameter and has a distinctive fracture that runs out from its center. Although it is known that Petravius crater is about 3.9
billion years old, the origin of its large
fracture is unknown. The craters are best visible a few days after a
new Moon, when
shadows most greatly accentuate vertical walls and hills. The
featured image is a composite of the
best of thousands of high-resolution,
infrared, video images taken through a small telescope. Although mountains on
Earth will likely erode into soil over a billion years,
lunar craters Langrenus and Petavius will likely survive many billions more years, possibly until the Sun expands and
engulfs both the
Earth and
Moon.
[url=https://apod.nasa.gov/apod/ap191111.html] [img]https://apod.nasa.gov/apod/calendar/S_191111.jpg[/img] [size=150]Lunar Craters Langrenus and Petavius[/size][/url]
[b] Explanation: [/b] The history of the Moon is partly written in its craters. Pictured here is a lunar panorama taken from Earth featuring the large craters [url=https://en.wikipedia.org/wiki/Langrenus_(crater)]Langrenus[/url], toward the left, and [url=https://en.wikipedia.org/wiki/Petavius_(crater)]Petavius[/url], toward the right. The craters formed in separate [url=https://apod.nasa.gov/apod/ap010428.html]impacts[/url]. [url=http://lroc.sese.asu.edu/posts/453]Langrenus[/url] spans about 130 km, has a terraced rim, and sports a central peak rising about 3 km. [url=http://lunarnetworks.blogspot.com/2012/12/lroc-petavius.html]Petavius[/url] is slightly larger with a 180 km diameter and has a distinctive fracture that runs out from its center. Although it is known that Petravius crater is about 3.9 [url=https://en.wikipedia.org/wiki/Lunar_geologic_timescale]billion years old[/url], the origin of its large [url=https://moon.nasa.gov/resources/371/fractured-crater/]fracture[/url] is unknown. The craters are best visible a few days after a [url=https://spaceplace.nasa.gov/dr-marc-moon-phases/en/]new Moon[/url], when [url=https://www.themadcatlady.com/wp-content/uploads/2012/10/SAM_1629.jpg]shadows most greatly accentuate[/url] vertical walls and hills. The [url=https://www.facebook.com/astrofotografiarafaela/photos/a.407916176064535/1072090396313773/?type=3&theater]featured image[/url] is a composite of the [url=https://en.wikipedia.org/wiki/Lucky_imaging]best of[/url] [url=https://www.youtube.com/watch?v=488OSfvqIcM]thousands of[/url] high-resolution, [url=https://science.nasa.gov/ems/07_infraredwaves]infrared[/url], video images taken through a small telescope. Although mountains on [url=https://epod.usra.edu/]Earth[/url] will likely erode into soil over a billion years, [url=https://www2.lpod.org/wiki/Main_Page]lunar[/url] craters Langrenus and Petavius will likely survive many billions more years, possibly until the Sun expands and [url=https://www.scientificamerican.com/article/the-sun-will-eventually-engulf-earth-maybe/]engulfs[/url] both the [url=https://solarsystem.nasa.gov/planets/earth/overview/]Earth[/url] and [url=https://solarsystem.nasa.gov/moons/earths-moon/overview/]Moon[/url].
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