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Astronomers

A group for people who enjoy the stars. :)

Members: 165
Latest Activity: on Friday

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From movie graphics to scientific tool

Started by Ruth Anthony-Gardner. Last reply by Joan Denoo Mar 26. 3 Replies

Two bright spots on Ceres.

Started by Visvakarman Svetasvatara-Upanish. Last reply by Gerald Payne Mar 19. 1 Reply

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Comment by Gerald Payne on Friday

  These coronal loops are a mystery/  Solar flares and  the like are tantalisingly

These coronal magnetic loops are tantalisingly beyond full understanding.

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Comment by Idaho Spud on Friday

Amazing sun images Joan.  I read what is pictured, but couldn't understand it all. 

They say the blue and yellow areas are opposite poles of the magnetic field, and the threads are magnetic flux.  Whatever is going on, it looks powerful and wild.

Comment by Patricia on Friday

Neat photo Joan.

Comment by Joan Denoo on Friday

May 22, 2015

Coronal Loops Over a Sunspot Group

May 22, 2015

Coronal Loops Over a Sunspot Group

Comment by Idaho Spud on May 16, 2015 at 1:37pm

Hope I'm around in 4 billion years to see the main show.

Comment by Patricia on May 16, 2015 at 1:24pm

Good clear diagram, thanks Gerald.

Comment by Gerald Payne on May 16, 2015 at 7:36am

The milky way and Andromeda galaxies, set to collide in 4 billion years may already be in contact. Using the Hubble telescope scientists have discovered a halo of gas surrounding Andromeda that's 2 light years in diameter. Being 2 light years distant, a similar halo around our galaxy would mean contact has already begun.

Quasars are the brightest objects in the Universe and so distant, relative to Andromeda that from them has to pas through Andromeda's halo. Light showed a minute dip at selected wavelengths as  it passed through the halo en route to Hubble

To detect Andromeda's halo, Lehner and team studied how the light of 18 quasars (five shown here) was absorbed by the galaxy's gas. Credit: NASA

Comment by Patricia on May 1, 2015 at 2:17pm

Amazing stuff, no matter how you look at it.

Comment by Gerald Payne on May 1, 2015 at 7:19am

Sending a probe to Mercury was the most challenging mission they've ever tried. The gravitational well of the Sun is so strong that the inner Planets, although the closest, are the most difficult to reach. It was estimated that a direct spaceflight to Mercury would need to burn so much fuel to check it's momentum there'd be no room for the scientific instruments!

Comment by Gerald Payne on May 1, 2015 at 6:57am

When we consider that they have only a 50 mile 'window' to hit to get the sling right after millions of miles of travel, with everything moving under the influence of gravity, it's no small feat.

 

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