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Astronomy News

Why Are the Galilean Moons So Massive?

Why Are the Galilean Moons So Massive?

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Scientists propose that Saturn’s meddling helped create the four giant Galilean moons orbiting Jupiter.

Europa's amazing surface

The Jovian moon Europa, as captured by NASA’s Galileo spacecraft.
NASA / JPL / SETI Institute

Jupiter, with its 67 known moons, can be viewed as a miniature solar system revolving around the Sun. Four of these moons are large enough to be visible with even a small telescope. These so-called Galilean satellites — Io, Europe, Ganymede, and Callisto — are of nearly planetary size.

But scientists haven’t been able to explain how these moons became so big. Now, scientists have conducted a study to suggest that Saturn might be to blame.

READ MORE

Astronomy News

Jupiter is at opposition tonight

Jupiter is at opposition tonight!The planet rises at sunset and will be visible until sunrise. It’s the best time to observe this beautiful planet!

https://www.space.com/40515-jupiter-at-opposition.html

https://www.accuweather.com/en/weather-news/jupiter-opposition-the-planet-will-be-at-its-brightest-on-tuesday-night/70004871
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Astronomy News

gorgeous pictures of Jupiter’s Red Spot

For gorgeous pictures of Jupiter’s Red Spot, go to

https://www.missionjuno.swri.edu/news/juno-spots-great-red-spot

Here’s a sample! Got to site to see the full resolution images.
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This enhanced-color image of Jupiter’s Great Red Spot was created by citizen scientist Kevin Gill using data from the JunoCam imager on NASA’s Juno spacecraft.

The image was taken on July 10, 2017 at 07:07 p.m. PDT (10:07 p.m. EDT), as the Juno spacecraft performed its 7th close flyby of Jupiter. At the time the image was taken, the spacecraft was about 6,130 miles (9,866 kilometers) from the tops of the clouds of the planet.

Astronomy News

Long Range Sensors Detect…

  1. Jupiter’s moons
  2. Rosetta Finds Clues to Earth’s “Xenon Paradox”
  3. Mini-Flares Might Threaten Life Around Red Dwarf Stars
  4. The Curious Case of Tabby’s Star

Jupiter’s moons: Two new moons have been discovered and 5 lost ones found again by researchers looking for Planet X.   READ MORE

Rosetta Finds Clues to Earth’s “Xenon Paradox” :  Xenon measured by the European Space Agency’s Rosetta spacecraft has shed light on a long-standing mystery about the role comets played in Earth’s formation. READ MORE

Comet 67P

The alien surface of Comet 67P seen from Rosetta’s OSIRIS wide-angle camera on May 17th from 9 kilometers away.
ESA/Rosetta/OSIRIS Team

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Mini-Flares Might Threaten Life Around Red Dwarf Stars: The interesting aspect of this article is that fan writers with astronomical knowledge have long considered Star Trek’s Vulcan to be a planet orbiting a red dwarf. This would explain the 3rd eyelid to protect against sudden blinding light.  READ MORE

http://www.skyandtelescope.com/astronomy-news/mini-flares-threaten-exoplanets-red-dwarf-stars/?

The Curious Case of Tabby’s Star:  Three new ideas have emerged to explain Tabby’s Star, officially known as KIC 8462852, but the jury’s still out on what’s really causing the weird behavior of our galaxy’s most mysterious star.

Comet swarm around Tabby's Star

This artist’s concept shows a swarm of comets passing before a star.
NASA / JPL-Caltech

The star KIC 8462852, also called Tabby’s Star, has been the subject of intense debate since May’s announcement that this unusual F-type star, located in the constellation of Cygnus, was dimming once again.

Observations at Fairborn Observatory detected a 2% drop in brightness between May 19th and 21st, and a host of ground- and space-based telescopes jumped in on the action.

Ever since the first public report of the mysterious star in 2015, numerous theories have been proposed to explain its bizarre behavior — sometimes the star’s brightness dims by a couple percent, like last May, but sometimes it dips by as much as 20%, and for days to weeks at a time. Not to mention the long-term fade that appears to be plaguing the star. So it’s no surprise, perhaps, that many proposed explanations have failed in their attempts to explain what’s going on.   READ MORE

Astronomy News

Long Range Sensors Detect…

  • Mars Lost Atmosphere to Space
  • Rosetta Sees Changing Face of Comet
  • Observing the planets Mars, Jupiter, Saturn this week

NASA’s MAVEN mission has confirmed that the solar wind stripped the Red Planet of its atmosphere.  http://www.skyandtelescope.com/astronomy-news/mars-lost-atmosphere-to-space-3003201723/Based on the ratio of various elements’ isotopes planetary scientists suspect that the Red Planet has lost anywhere from 25% to 90% of its atmosphere over the last 4-ish billion years, with the estimates favoring at least 50%. READ THE ARTICLE

Researchers have used data from the Rosetta mission to link outbursts on Comet 67P/Churyumov-Gerasimenko with dramatic surface changes.  Changes seen on the comet’s surface provide researchers with the before and after “smoking gun” of seeing the possible triggering mechanism for a cometary outburst in action. READ THE ARTICLE

 

Jupiter (magnitude –2.5, in Virgo) comes to opposition on April 7th. It rises around sunset, shines low in the east-southeast after nightfall, high in the southeast by 11 p.m., and highest due south around 1 a.m. daylight saving time. Spica hangs 7° below it. In a telescope Jupiter is 44 arcseconds across its equator.

Mars and Mercury in the twilight.

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Saturn over Sagittarius at dawn, early April 2017

Saturn (magnitude +0.4, in Sagittarius upper right of the Teapot) rises in the early morning hours and glows in the south by early dawn. Redder Antares (magnitude +1.0) twinkles 19° to Saturn’s right. Saturn doesn’t reach opposition until June 14th.

The blue 10° scale is about the width of your fist at arm’s length.