Astronomy news

A Catastrophe of Comets

A Catastrophe of Comets is the title of a post at http://craterhunter.wordpress.com/ parts one and two. The blog author claims there has been little independent geological research in Chihauhua in northern Mexico - apart from mining companies. The standard theory is that ignimbrites date to mid-Tertiary when vast rifts are thought to have opened up in the middle of the North American continent that spread out thousands of cubic miles of ignimbrite - then closed again without trace.

Searching for Neutrinos

At www.physorg.com/print190976193.html April 20th ... a series of detectors to capture cosmic rays striking the Earth has been set up in Antarctica with the idea of finding neutrino generated signals bounced off the bottom of the ice cap. It is hoped they will be able to pinpoint the unidentified source of ultra high energy cosmic rays. The Earth is constantly peppered by showers of debris from cosmic ray outburst colliding with atoms in the atmosphere.

The Solar Dynamics Observatory

NASAs new Eye on the Sun delivers a series of stunning images at www.nasa.gov/sdo (and see also http://wattsupwiththat.com April 21st). Some images show material streaming away from sun spots - others are close-up images of the surface of the Sun. The spacecraft has also made high resolution measurements of solar flares in a range of ultra-violet wavelengths.

Electrified Lunar Craters

Science Daily April 17th (www.sciencedaily.com/releases/2010/04/100416185151.htm ) ... as the solar wind flows over natural obstructions on the moon it may charge polar lunar craters to 100s of volts according to new NASA calculations. Polar lunar craters are an object of interest as a possible source of water for astronauts and have therefore attracted interest. The moon's orientation towards the sun keeps polar craters in permanent shade - allowing temperatures to plunge to -400 degrees Fahrenheit.

Black Holes

Daily Galaxy April 16th (www.dailygalaxy.com) ... does our universe exist in a black hole? Cosmic string theorists, it is alleged, have suggested the whole universe may exist in a black hole. In their view the pre-Big Bang universe is vast, infinite, and stretches indefinitely backwards in time. They think the universe might be destroyed on a regular basis - it's space time twisted into black holes.

Dark Matter Doubts

At www.physorg>com/print190631146 ... astrophysicists are looking everywhere for dark matter - inside the Large Hadron Collider, in deep mines, and way out in space, but evidence of dark matter cannot yet be found. It is claimed it makes up a quarter of the energy density of the universe. Current models and simulations cannot acount for the excess in positrons being observed - on the satellite experiment of PAMELA for instance.

Black Holes, Sprites, Solar Flares and Interstellar Water

At www.physorg.com/print190485260.html ... research has found natural particle accelerators can be formed by lightning storms. When intense lightning discharges in thunderstorms coincide with high energy particles (cosmic rays) coming in from space nature forms a giant particle accelerator above the clouds - stripping electrons from air molecules. He is referring to lightning discharges above thunderstorms - known as sprites (see below).

Time Dilation

At www.physorg.com/print190027752.html there is a story with the title, 'Discovery that quasars don't show time dilation mystifies astronomers' ... which sounds like a question mark against the Big Bang Theory. The phenomenon of time dilation is explained by i) the speed of light is constant, and ii) the universe is expanding at an accelerating rate which causes light from distant objects to redshft. As space expands the interval between light pulses also lengthens.

Venus in the Sky

At www.physorg.com/print189959182.html is an article to warm the cockles of old time SIS stalwarts. It has the title, 'Venus is Alive - geologically speaking' and refers to images sent back from the Venus Express spacecraft that show young lava flows on the surface of the planet. There is also a video that can be clicked on with a visual insight of the discovery - refuting some scientists who claim it is geologically inactive because the surface of the planet is too smooth.

Bill Napier paper on the YD boundary event

The Bill Napier paper pops up at http://arxiv.org/abs/1003.0744 and is provided by the Royal Astronomical Society (see earlier post and link to pdf). Basically, Bill Napier is saying the YD event was not caused by a comet impact or airburst as such but by thousands of comet fragments and debris, a signifcant difference to the model developed by Firestone and West et al.