Posted in Astronomy at 8:07 pm on 13 November 2014
Archives » Astronomy
Posted in Astronomy at 12:00 pm on 28 August 2014
This is via Astronomy Picture of the Day, 26//8/14.
Neptune’s largest moon Triton.
The movie has been stitched together from still pictures taken by Voyager 2 on its fly past.
The Voyager missions must have been Nasa’s most successful unmanned investigations of the Solar System.
Apparently the green colour of the moon is real.
Posted in Astronomy at 8:49 pm on 11 August 2014
Posted in Astronomy at 7:16 pm on 2 June 2014
Below is a video of a solar coronal mass ejection on 9/5/14 as observed by NASA’s IRIS satellite.
The eruption occurs at 1.5 million miles per hour. You don’t want to get in the way of that.
Posted in Astronomy at 1:00 pm on 10 April 2014
I haven’t done an astronomy post for ages.
This one intrigued me. An asteroid with a ring system? Yes it would seem.
The animation and occultation measurements below appeared on Astronomy Picture of the Day on 9/4/14.
Posted in Astronomy at 12:00 pm on 6 February 2014
Posted in Astronomy at 12:00 pm on 28 December 2013
This video of the larger of Mars’s two moons, Phobos, was Astronomy Picture of the Day for Dec 25th.
You can’t actually see this rotation from the surface of Mars as Phobos is tide-locked to its primary in the same way Earth’s Moon is to its.
Posted in Astronomy at 12:00 pm on 2 December 2013
Posted in Astronomy at 8:26 pm on 28 November 2013
This is a video of comet ISON which, since it has now passed within about one solar diameter of the Sun, may have broken up and faded by now but otherwise promised to become a very bright object in the night sky. The video featured on Astronomy Picture of the Day yesterday.
The sun gives out light across the visible spectrum (the colours of the rainbow) and beyond. We see the sun itself as yellow or red according to its position in the sky and what we experience as “white” light is made up of all the colours. If that light is passed through a prism or difraction grating it splits up into these colours.
What about when the sun’s rays are blocked?
Constantine Emmanouilidi caught a great picture of the sun’s spectrum split in this way but during an eclipse. This was Astronomy Picture of the Day for 15/11/13.
Thanks to Mr Emmanouilidi for permission to copy his picture.
It was through images similar to this where a line spectrum is obtained that the chemical element helium was discovered in the sun’s atmosphere before it was isolated on Earth.