Tomas Martin @ 11-03-2008
Tomas Martin @ 07-03-2008
The Large Binocular Telescope in Arizona has ‘opened its eyes’ for the first time, marking one of the first in a new wave of high-tech astronomical devices to come online. The LBT combines two 8m mirrors working in tandem to take pictures of the sky in a wide range of wavelengths at resolutions higher than that of Hubble.
Another couple of new telescopes, Herschel and Planck, will come online this year following their launch into space in April. Laser Interferometer LISA, which measures the bending of space time, has been given the go ahead but won’t be ready for a decade. A spate of advanced telescopes are in planning and construction, taking advantage of the computer advances of the last decade to give more accurate and detailed pictures of the sky than ever before.
[story and image via BBC]
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Tomas Martin @ 12-12-2007
As astronomers look further back in time, they need more powerful, higher resolution instruments. As well as the search for extrasolar planets, one of the key areas the new technology will be looking at is the epoch of reionisation, some one billion years after the big bang. 400,000 years after the big bang, the universe cooled enough to become opaque, so that very little light was being emitted for us to observe. Later the universe began to change and objects like stars and galaxies formed. The heat from these first objects began ionising the neutral gas of the universe, creating more stars and galaxies in bubbles of hotter regions that eventually spread to form the reionised universe we see today.
Some of the designs for new telescopes are incredible. The picture shows the E-ELT, one of the new designs of Extremely Large Telescopes (anything over 20m in diameter). The small white shape in the bottom left is a car! The awesome James Webb Space Telescope will launch in 2013 to replace the Hubble Telescope. Its mirror and tennis court-sized sunshield unfold in space once it reaches its home orbiting L2, some 1.5 Million km from Earth. ALMA, LOFAR and SKA will links tens or even thousands of smaller radio telescopes together as one massive array, stretching out across continents. The next decade will truly be a revolution in the devices astronomers use to study the sky.
[This is a version of a talk I gave as part of my masters course at Bristol University last week]
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Tomas Martin @ 16-11-2007
Earlier in the year a gigantic explosion lit up the sky. Supernova SN 2006gy, around 100 times brighter than a typical example, created a real puzzle to astronomers - how did such a big event occur? Currently there are two main models for Supernovae - type I occur when a white dwarf accretes too much material from another partner star and crosses the unstable Chandrasekhar limit, forcing nuclear fusion in the core. The second principle type, type II has a larger older star running out of hydrogen in its core to burn, leaving the outer layers cooling and falling inward. When the pressure from the infalling layers gets high enough, the helium ignites - a type II supernova.
The sheer brightness of SN 2006gy doesn’t fit any current theories, and has left astronomers baffled. A new model suggests that the star exploded not once but twice or as much as SIX time, with the outward material from later novas hitting earlier remnants to create the bright lights in the sky. A somewhat similar star, Eta Carina, is not too far off exploding in our own galaxy, which should provide an amazing night show.
[story and image via Science Daily]
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Paul Raven @ 23-08-2007
I’m late to the party as far as announcing the arrival of the new Google Earth features that let you explore the sky as well as the ground, but I’m not going to let that stop me. Once the excitement of roaming the real stars has faded, however, you can skip on over to Galaxiki - which, as the name suggests, is a wiki-based community that is building a fictional galaxy by describing the star systems within it.[BoingBoing]
I quite like the idea of being able to create my own solar system … for one thing, I’d make sure that I avoided picking a sun that does freaky stuff to its planets with low-frequency waves. We’re all doomed! Possibly. [Image by jesiehart]
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Alpha Centauri is the closest star system to our own but with a bonus: there are three stars rather than one. It’s also one of the best chances we know in the local area to have a planet similar to Earth capable of developing life like ours.
