Adventure Ausrama Blog

Science: the latest meteorite give insight into formation of the solar system Scientists are interested in a space rock. The meteorite crashed into the Australian outback a year ago and has unique features. It is currently in London undergoing tests and will eventually be returned to the Museum of Western Australia. The meteorite is small, only as big as a tennis ball. Because its trajectory was tracked its origin is known. This is unusual: of the 50,000 meteorites that have hit the Earth over the last 200 years  the sources of only 10 have been ascertained. Tracking of the meteorite was carried out by Curtin University, London's Imperial College and the Ondrejov Observatory in the Czech Republic. The point of impact was only 100m from the projected point. Meteorites are the oldest rocks being 4.5 billion years old. Critical information about the formation of the solar system will be gained. ◆ Science by Ty Buchanan   ◆ Adventure Australia Funny Animal ...

It is presumed that planets are changing orbital speed at exceedingly slow rates and it will take millions of years for any significant alteration in the "balance" of orbits in the solar system. This theory has recently been confounded. Venus was thought to be in a fixed orbit of 243.0185 days, but when astronomers went looking for it, it was found 20 kilometers further back than it should have been. Calculations showed the orbit had slowed by 6.5 minutes. This will mean that computer computations will have to be altered for future planetary probes to Venus. This is a drastic rethink for scientists. For some reason Venus is affected more by fierce weather conditions and planetary gravitational interaction than other planets. There could be a simpler explanation. Venus could be travelling at different rates in its orbit due to getting close to other planets. It could be a normal slow down period. http://www.adventure--australia.blogspot.com/ http://www.tysaustrali...

Australia has determined how fast the Universe is expanding. A student planning to study a PhD, Florian Beutler, has measured the Hubble constant. This is a special number that enables measurement of the age and size of the Universe. The Universe continues to expand with galaxies moving apart. Direction and speed that galaxies move are easy to measure, but distance of separation is more difficult. In the past, brightness of galaxies has been used to define this distance. Florian Beutler used data from a survey carried out with the UK's Schmidt Telescope to make calculations using a new method. Galaxies are in clusters throughout the Universe. The 6dF survey provided information about these clusters which enabled distant to be defined with an error of less than 5 per cent. The speed of expansion is very close to the figure determined by other methods. The Hubble constant is 67.0 +/- 3.2 km s-1 Mpc-1. http://www.adventure--australia.blogspot.com/ http://www.tysaustralia.blogspo...