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November 07 2017

November 05 2017

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astronomyblog:

Io - The Volcanic Moon

Looking like a giant pizza covered with melted cheese and splotches of tomato and ripe olives, Io is the most volcanically active body in the solar system. Volcanic plumes rise 300 km (190 miles) above the surface, with material spewing out at nearly half the required escape velocity.

A bit larger than Earth’s Moon, Io is the third largest of Jupiter’s moons, and the fifth one in distance from the planet.

Although Io always points the same side toward Jupiter in its orbit around the giant planet, the large moons Europa and Ganymede perturb Io’s orbit into an irregularly elliptical one. Thus, in its widely varying distances from Jupiter, Io is subjected to tremendous tidal forces. These forces cause Io’s surface to bulge up and down (or in and out) by as much as 100 m (330 feet)! Compare these tides on Io’s solid surface to the tides on Earth’s oceans. On Earth, in the place where tides are highest, the difference between low and high tides is only 18 m (60 feet), and this is for water, not solid ground!

This tidal pumping generates a tremendous amount of heat within Io, keeping much of its subsurface crust in liquid form seeking any available escape route to the surface to relieve the pressure. Thus, the surface of Io is constantly renewing itself, filling in any impact craters with molten lava lakes and spreading smooth new floodplains of liquid rock. The composition of this material is not yet entirely clear, but theories suggest that it is largely molten sulfur and its compounds (which would account for the varigated coloring) or silicate rock (which would better account for the apparent temperatures, which may be too hot to be sulfur). Sulfur dioxide is the primary constituent of a thin atmosphere on Io. It has no water to speak of, unlike the other, colder Galilean moons. Data from the Galileo spacecraft indicates that an iron core may form Io’s center, thus giving Io its own magnetic field.

Io was discovered on 8 January 1610 by Galileo Galilei. The discovery, along with three other Jovian moons, was the first time a moon was discovered orbiting a planet other than Earth.

image

Eruption of the Tvashtar volcano on Jupiter’s moon Io, photographed by New Horizons.

Image credit: NASA/JPL/Galileo/New Horizons ( Stuart Rankin | Kevin Gill)

Source: NASA

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astromech-punk:

Star Quest by Guillaume Singelin 

Reposted byghalbadiousaren

November 03 2017

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spacethatneverwas:

Real space mission

A long overdue tribute to Cassini spacecraft, that was dropped into Saturn’s atmosphere a month ago, after bringing us breathtaking photos and science for nearly 20 years.

Today, 20 years ago, on 15th October 1997, Cassini spacecraft launched on top of Titan IVB (with Centaur upper stage) rocket from Cape Canaveral Air Force Station Space Launch Complex 40

If you want to learn more about the Cassini mission, you can visit the official NASA mission website or read the article on Wikipedia or even get a really great book about the mission (lots of technical information if you are into such things).


Prints of this and other artworks are available in my society6.com and deviantART.com shops.

Reposted bypati2k6 pati2k6
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startswithabang:

The Hubble Space Telescope Is Falling

“The truth is that, more than any other observatory in history, the Hubble Space Telescope has changed how we view the Universe. Although other ground-based and space-based observatories have been built and will be flying that surpass Hubble on a number of fronts, for some classes of observing, it’s still the best tool humanity has ever created. But by the very nature of its orbit, not only is its lifetime finite, but its demise will come in a horrific, potentially dangerous fashion if we do nothing. Saving it for further use is a long-term project that requires planning now. Hubble is falling, and if we don’t take the steps to catch it soon, it will be too late.”

Orbiting at hundreds of miles above Earth’s atmosphere, you’d think the Hubble Space Telescope would be safe and stable for a long time. But despite our definitions, Earth’s atmosphere doesn’t “end” and space doesn’t “begin” when we get 60 miles (100 kilometers) up. Instead, Earth’s atmosphere continues, albeit tenuously, for incredible distances, until it eventually merges with the solar wind. It’s the fourth (of five) layers that contains the Hubble Space Telescope: the thermosphere. Although each oxygen molecule might travel for a kilometer before striking another, the presence of these molecules is enough to slowly produce a drag on Hubble. Over the timespan of years and decades, it loses altitude and begins to fall. If we do nothing, then by the late 2020s to the mid-2030s, it will uncontrollably de-orbit on its own. Our greatest optical observatory will be lost, and there are no plans to save it.

Come learn how the Hubble Space Telescope is falling, what we can do, and why we need to act now.

October 31 2017

October 28 2017

October 27 2017

September 28 2017

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hier: Cortona

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hier: Cortona

Reposted byCarridwen Carridwen

August 30 2017

Terms of Service; Didn't Read

estrobot:

This website reads Terms of Service and ranks them so you don’t have to – because, let’s be real, you don’t.

Reposted byseverakdarksideofthemoonsofiaspsyentistshowmetherainbowv2pxpassingbirdDagarhenzurawianiaczkaleniwabulakethralAluAlu02mydafsoup-01Rekrut-KJimjohnschaafmolotovcupcakeeglerion-seriously

August 26 2017

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land-of-maps:

The world’s network of undersea cables [8268 × 5177]

Reposted bypsyentistRekrut-Kmappornvolldostdivijanuschytrus4pocsputnikstreetartnaichyogrtvanionschaafwhoville02mydafsoup-01phooldonaudampfschifffahrtsgesellschaftfinkreghnoxeodivigroeschtl
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sagansense:

“Long ago, when an early galaxy began to pour light out into the surrounding darkness, no witness could have known that billions of years later some remote clumps of rock and metal, ice and organic molecules would fall together to make place called Earth; or that life would arise and thinking beings evolve who would one day capture a little of that galactic light, and try to puzzle out what had sent it on its way. And after the earth dies, some 5 billion years from now, after it’s burned to a crisp, or even swallowed by the Sun, there will be other worlds and stars and galaxies coming into being – and they will know nothing of a place once called Earth.”

Carl Sagan

August 23 2017

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Feierabend. (hier: Innenstadt, Cologne)

July 21 2017

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hier: Gutshotel Baron Knyphausen

July 06 2017

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Endlich geht es weiter. @DB_Bahn (hier: Bonn Hauptbahnhof)

June 30 2017

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Oh ja, Erdinger Sommerweise, kann man machen. Lecker! (hier: Innenstadt, Cologne)

June 22 2017

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Joah. #Bierzeit (hier: Köln-Innenstadt)

June 14 2017

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