6 posts tagged with astronomy by blahblahblah.
Displaying 1 through 6 of 6.
Earth is not a quiet planet. It transmits a rather hideous sound [flash] into space that is 10,000 times greater in strength than any man-made radio transmission. The Earth also quietly hums with seismic Love Waves (hear them), while the Magnetosphere is alive will all sorts of sounds (check out the creepy-sounding Chorus Emissions). Also, stars sing out in middle C before they explode as supernovae, and the Perseus Cluster black hole has droned a B-flat for the past 2.5 billion years.
Using a $20,000 CCD camera and some new software, ground-based telescopes can now get images as good as the Hubble Telescope in many situations [some images ]. By taking many high-quality pictures quickly and taking the best parts of each, Lucky imaging compensates for atmospheric effects to produce lovely images. You can do it too, using free software and any webcam.
Under alien skies: Start with the simply stunning Exosolar, a flash-based interface for navigating through 2,000 nearer stars in 3-D, including all discovered planets outside our solar system. See what the skies would look like from other planets and suns. Explore star maps from many science fiction universes, from Star Trek to Dune. Watch the Big Dipper change its shape over a hundred thousand years. Zoom into a face-on map of the Milky Way that would cover 16 square meters if printed, and see the Atlas of the Universe. [prev. on extrasolar planets, prev. on star maps]
An interactive map of the 174 major meteor impact craters. The largest crater we know of is the Vredefort Dome in South Africa, caused by a meteor some 10 km in diameter. Almost as large in the Sudbury Structure, located in Ontario, which contains some of the world's richest nickel and copper reserves, and has been only confirmed recently to be a crater. Third largest is the now-famous Chicxulub crater in the Yucatan, which probably killed the dinosaurs. Then take a look at an animation of asteroids near Earth [animated gif] and the list of minor planets that could hit us. Want to find out what happens when an meteor impacts in your area? Use the handy Earth Impacts Effects Program!
The Worlds of David Darling. British astronomer and science writer David Darling has written over 10,000 articles for three massive online efforts: the Encyclopedia of Astrobiology, Astronomy, and Spaceflight, the Encyclopedia of Alternative Energy and Sustainable Living , and a related encyclopedia of concept vehicles. Though the diversity of entries can be eccentric, and some are quite short, the science seems solid: learn about the illicit corned beef sandwich of Gus Grissom, peruse a comprehensive set of advanced space propulsion concepts, and see a terrific illustrated listing of strange land and air vehicles (don't miss the Peel P50 microcar and the Volvo Gravity Car).
The number of communicating alien civilizations = R* x fp x ne x fl x fi x fc x L. The formula is the Drake Equation, and modern estimates range from several thousand to none but us. You can solve it yourself. What is your estimate of the number of alien civilizations out there?