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Latest Activity: on Friday
Started by Patricia Apr 11.
Started by Ruth Anthony-Gardner. Last reply by Joan Denoo Mar 26.
Started by Visvakarman Svetasvatara-Upanish. Last reply by Gerald Payne Mar 19.
These coronal loops are a mystery/ Solar flares and the like are tantalisingly
These coronal magnetic loops are tantalisingly beyond full understanding.
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.
Neat photo Joan.
Hope I'm around in 4 billion years to see the main show.
Good clear diagram, thanks Gerald.
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
Amazing stuff, no matter how you look at it.
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!
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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