happy birthday Hubble from stuartPosted: April 24, 2010
Happy birthday Hubble ! Thank you for many years of stunning views of the Universe.
I have to say Emma pretty much took the best image Hubble has ever taken as her favorite. Its a hard act to beat ! I am however very partial to this series of images taken by Hubble over the years.
As the glorious Hitchhikers Guide to the galaxy tells us “Space… is big. Really big. You just won’t believe how vastly hugely mindbogglingly big it is. I mean you may think it’s a long way down the road to the chemist, but that’s just peanuts to space…”. A lot of things in space are big as well and that normally means that the time scales over which they change are very long. So long in fact that its often very hard to see things changing at all, the universe appears timeless. What I love about these images of the variable star V838 Monocerotis is that over only a few years we can see the image of the star changing.
The star at the center of this image underwent a catastrophic outburst. In a short period of time it became roughly 1 million times brighter than our sun, giving out a huge amount of light in the process. The light which came directly towards us arrived first but then gradually over the years, light heading away from the star in a shell, reflected off of surrounding gas and dust eventually heading towards the earth. As we let time go on the light illuminates different regions around the star.
Despite the fact that the images look like they are showing a concave bubble around the star its actually convex with the material which appears to the the side of the bubble closer to us actually being behind the star.
I just love seeing something in the sky evolve in this way! Thanks again Hubble !