Posted in Astronomy at 8:49 pm on 11 August 2014
Archives » Astronomy
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.
Posted in Astronomy at 11:00 pm on 18 September 2013
Since it’s tidally locked to its parent planet people from Earth do not normally see the Moon rotating. However the Lunar Reconnaissance Orbiter (LRO) has built up a series of pictures allowing a video of the rotating Moon to be compiled. This video was Astronomy Picture of the Day for 16/9/13.
It starts with the familiar view from Earth – a side which has an abundance of dark areas known as maria which are relatively low-lying – then the rotation shows the “far” side as much lighter in colour. This lightness is due to lunar highlands.
Posted in Astronomy at 12:06 am on 23 July 2013