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#PPOD: Io is the volcanic moon of Jupiter and is seen here in an image taken in 1979 by NASA's Voyager 1 spacecraft. Loki Patera is Io's largest volcanic depression at 202 kilometers in diameter and contains an active volcanic lake. Io's volcanism results from the gravitational forces being applied to the tiny moon by Jupiter on one side and the larger Galilean moons on the other. Credit: NASA/JPL/Voyager-ISS/ @andrealuck CC BY (https://www.flickr.com/photos/192271236@N03/53668923876/ )

#space #science #scicomm #jupiter

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#PPOD: How does a comet tail change? It depends on the comet. The ion tail of Comet 12P/Pons–Brooks has been changing markedly, as detailed in the featured image sequenced over nine days from March 6 to 14 (top to bottom). Reasons for tail changes include the rate of ejection of material from the comet's nucleus, the strength and complexity of the passing solar wind, and the rotation rate of the comet. Credit: Shengyu Li & Shaining via APOD

#comet #photography #scicomm #science

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#PPOD: This near-infrared, color mosaic from NASA's Cassini spacecraft shows the sun glinting off of Titan's north polar seas. The sunglint, a specular reflection, is the bright area near the 11 o'clock position at upper left. This mirror-like reflection, known as the specular point, is in the south of Titan's largest sea, Kraken Mare, just north of an island archipelago separating two separate parts of the sea. Credit: NASA/JPL-Caltech/University of Arizona/University of Idaho

#space #scicomm

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#PPOD: Shown in the center of this image, Pan (28 kilometers) orbits within the Encke Gap of the A ring. Other bright specks in the image are background stars. As Saturn approaches its August 2009 equinox, the planet's moons cast shadows onto the rings. This view looks toward the unilluminated side of the rings from about 51 degrees above the ringplane. The image was taken in visible light with the Cassini spacecraft on May 2, 2009. Credit: NASA/JPL/Space Science Institute/CICLOPS

#scicomm

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: In the far southeast corner of Libya, in the Libyan Desert, lie the uplifted massifs of Jebel Awenat and Jebel Arkenu. Both expose ancient Precambrian rocks, intruded by granites and then overlain with sandstones. Folding and doming have produced these interesting shapes, rising above the surrounding sand sea. Presently, the area receives less than one inch of rain per year. Credit: NASA/METI/AIST/Japan Space Systems, and U.S./Japan ASTER Science Team

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#PPOD: On April 8, 2024, a NASA photographer captured the total solar eclipse in Dallas. A small part of North America, from Mexico’s Pacific coast to the Atlantic coast of Newfoundland, Canada, saw the total solar eclipse, while all of North America and parts of Central America and Europe saw a partial solar eclipse. The next total solar eclipse that will travel across the lower 48 states from coast to coast is in 2045. Credit: NASA/Keegan Barber

#photography #totaleclipse #scicomm

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#PPOD: The Moon's shadow, or umbra, is pictured covering portions of the Canadian provinces of Quebec and New Brunswick and the American state of Maine in this photograph from the International Space Station as it soared into the solar eclipse from 420 kilometers above the surface of Earth. The diameter of the shadow is 160 km. Credit: NASA

#eclipse #photography #space #science #scicomm

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: Saturn's moon Enceladus was caught spraying icy vapor into space from its south pole. Image taken by NASA's Cassini spacecraft on May 2, 2012. Credit: NASA/JPL-Caltech/SSI/CICLOPS/Jason Major

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#PPOD: Though #Mars is the Red Planet, false-color images can help us learn about its weather and geology. This image shows various wind-related features on the Red Planet near the center of Gamboa Crater. Larger sand dunes form sinuous crests and individual domes. There are tiny ripples on the tops of the dunes, only several feet from crest to crest. These merge into larger mega-ripples about 30 feet apart that radiate outward from the dunes. Credit: NASA/JPL-Caltech/University of Arizona

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: From yesterday's eclipse live stream, scientist Ryan Lambert captured a special moment during totality when he removed the solar filter from his Unistellar Odyssey telescope. At the bottom of the disk, peeking out from behind the Moon is a large solar prominence. A smaller one can be seen at the 4 o'clock position. Credit: Ryan Lambert, Franck Marchis

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: Nebula Pa 30 appears in the same sky direction now as a bright "guest star" did in the year 1181. Although Pa 30's filaments look similar to that created by a nova (for example GK Per), and a planetary nebula (for example NGC 6751), some astronomers now propose that it was created by a rare type of supernova: a thermonuclear Type Iax, and so is (also) named SN 1181. Credit: NASA, ESA, USAF, NSF

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#PPOD: Taken by NASA's Cassini spacecraft on September 12, 2007, this image of Saturn's outermost large moon Iapetus has been assembled from infrared, green, and ultraviolet-filtered images (IR1/GRN/UV3). The large craters Engelier and Gerin are near the top right. Credit: NASA/JPL-Caltech/SSI/CICLOPS/Kevin M. Gill

#space #science #saturn #scicomm

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#PPOD: This spectacular view of Gosses Bluff (known as Tnorala to the Aboriginal people), Northern Territory, Australia, was photographed from the International Space Station. About 142 million years ago in the early Cretaceous period a meteorite probably one kilometre in diameter struck in the heart of Australia, blasting a 22-kilometre-wide hole out of the earth's crust. Credit: NASA

#earth #impactcrater #scicomm #science

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#PPOD: This massive dust storm was captured by multiple Martian orbiters on June 1, 2022. The composite here is compiled from images taken by China's Tianwen-1 spacecraft. The storm looms near the mighty Olympus Mons (not seen in this photo).

Credit: CNSA/CLEP/PEC/MoRIC
Processing: @andrealuck (https://www.flickr.com/photos/192271236@N03/52929040126/)

#wallpaperwednesday #mars #scicomm

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: Comet 12P/Pons-Brooks graces the evening sky above the summits of Kežmarský štít (8,389 ft/2,557 m), at right, and Lomnický štít (8,635 ft/2,632 m), at left in the Tatra Mountains of Slovakia. At the summit of Lomnický štít is a small domed building. This structure is the Skalnaté pleso Observatory, one of the highest astronomical observatories in central Europe. Credit: Petr Horálek - Institute of Physics in Opava (https://www.petrhoralek.com/)

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#PPOD: This NASA/ESA Hubble Space Telescope image shows LEDA 42160, a galaxy about 52 million light-years from Earth in the constellation Virgo. The dwarf galaxy is one of many forcing its way through the comparatively dense gas in the massive Virgo cluster of galaxies. The pressure exerted by this intergalactic gas, known as ram pressure, has dramatic effects on star formation in LEDA 42160. Credit: ESA/Hubble & NASA, M. Sun

#space #science #scicomm

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: Jovian System

Io and Jupiter as photographed by the approaching Voyager 2 spacecraft in 1979.

Credit: NASA/JPL-Caltech/SSI Via Ted Stryk

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#PPOD: A collapsed lava tube in Hephaestus Fossae on Mars was imaged by HiRISE, the high-resolution camera onboard the Mars Reconnaissance Orbiter. Credit: NASA/JPL-Caltech/University of Arizona

Note: Full high-resolution frames are usually about 1 km across; however, this image was cropped. This skylight is still probably several hundred meters across.

#wallpaperwednesday #mars #space #science #scicomm

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#PPOD: Earth hangs above a large boulder examined by Apollo 17 astronauts Gene Cernan and Jack Schmidt in December 1972. A recent analysis of freshly opened samples from Apollo 17 found that the Moon is at least 4.46 billion years old, or roughly 40 million years older than revealed by other samples. Credit: NASA

#earth #moon #palebluedot #scicomm #space

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: This is actually a mud volcano in eastern Russia, named Pugachevskiy. It is located on the Sakhalin island. The mud volcanoes are formations generated by the release of gases and liquids. The mud is pushed to the surface as the pressure builds up beneath the Earth, creating an unusual pattern. We could not find a precise measurement of its size, but judging from other photographs, it is likely around 100 m in diameter. Credit: Mikhail Mikhailov/Caters News Agency

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#PPOD: What may look like a strangely nearby galaxy is actually a normal rocket's exhaust plume -- but unusually backlit. Like noctilucent clouds, the plume's brightness is caused by the Twilight Effect, where an object is high enough to be illuminated by the twilight Sun, even when the observer on the ground experiences the darkness of night. The spiral shape is caused by the Falcon rocket reorienting to release satellites in different directions. Credit: Seung Hye Yang

#apod #scicomm #spacex

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#PPOD: St. Patrick’s Aurora Illuminates the Night Sky

This majestic image of the dazzling green lights of the aurora borealis was captured on March 17, 2015, around 5:30 a.m. EDT in Donnelly Creek, Alaska.

Credit: Sebastian Saarloos

#photography #nature #scicomm

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#PPOD: Images from NASA's Mars Curiosity rover’s pioneering encounter with sand dunes on Mars constrain the wind speeds required to move sand in the thin Martian atmosphere. This encounter took place almost seven years ago and gave scientists important data about the ability of the Martian atmosphere to move particles. It did not hurt either that this image was just spectacular! Credit: NASA/JPL-Caltech/MSSS

#mars #space #science #scicomm

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#PPOD: In 2018, super typhoon Trami wreaked havoc on Japan, as strong winds and torrential rains battered the country. In the days leading up to the incredible typhoon, there was no better view of the devastating storm than from outer space. From his perch at the International Space Station, astronaut Alexander Gerst snapped incredible photos of the typhoon a few days before it hit land. Here you can clearly see the eye!! Credit: ESA/NASA-A.Gerst

#photography #space #weather #scicomm

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#PPOD: Located in northeastern Greenland on the Kronprins Christian Land peninsula, Elephant Foot Glacier is not connected to Greenland’s main ice sheet. Rather, it’s part of a network of glaciers and ice caps that pepper the periphery of the island. Research has shown that these outlying glaciers and ice caps account for 5 to 7 percent of Greenland’s total ice coverage but are responsible for 20 percent of its contribution to sea level rise. Credit: Kashif Pathan / Flickr

#earth #scicomm

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