Skywatch and Hubblewatch Podcast
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It's a big sky -- someone has to watch it. This quick, weekly audio broadcast explores the astronomy news of the day, with topics ranging from dark matter to nearby planets. Join hosts Carol Christian of the Space Telescope Science Institute and Jim O'Leary of the Maryland Science Center for the latest buzz on space. SkyWatch also includes HubbleWatch, a monthly round-up of news from NASA's Hubble Space Telescope.
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http://hubblesite.org/explore_astronomy/skywatch/
Show 373: Voyager Reaches Edge of Solar System
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Jan 12, 2012
NASA's Voyager 1 is now 11 billion miles from Earth. The spacecraft has entered a new region between our Solar System and interstellar space. The data from Voyager over the past year reveals a new region where the wind of charged particles from Sun has diminished, and particles from inside the solar system seem to be "leaking" out into interstellar space.
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Show 372: New Stonehenge Revelations
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Jan 05, 2012
Two new discoveries about Stonehenge indicate an even longer history of solar significance and a connection with a site in Wales where builders quarried stones.
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Show 371: HubbleWatch for January 2012
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Author: Carol Christian Author: &Author: Jim O'Leary
Wed, Jan 04, 2012
Astronomers apply a new technique to old Hubble data to discover planets. And Hubble finds a multitude of stars arising from minute galaxies.
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Show 370: Kepler finds Earth-like planets
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Dec 29, 2011
NASA's Kepler mission, launched in March 2009, is observing 150,000 stars to discover planets. The ultimate goal is to discover Earth-sized planets, and in particular, Earth-sized planets in the zone around the parent star that is the right temperature for water. Over 1,000 planet candidates from Kepler have been cataloged, mostly planets larger than Earth. Now Kepler has announced the discovery of several nearly, Earth-sized planets, one right in the habitable zone. It's a new, exciting milestone in the search for an Earth twin.
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Show 365: Comet Bombardment
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Nov 24, 2011
Over 3 billion years ago, comets bombarded the inner solar system, scarring and cratering the Moon. The comets also struck Earth, delivering water and carbon to our planet. Crucial ingredients for life were deposited on the surface, and the first evidence for life appears shortly after this period. New data from the Spitzer Space Telescope suggests that the system around a star called Eta Corvi may be undergoing this type of event now, giving us a look at what may have happened early in the history of our solar system.
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Show 363: New Planets in Old Data
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Nov 10, 2011
Finding extrasolar planets seems to be routine these days, with a variety of telescopes using different techniques to find them. In some cases, once the planets are found, it pays to go back and see if the planets were unknowingly detected in earlier data. Recently, analysis of data taken with the Hubble Space Telescope in 1998 revealed extrasolar planets that were discovered years later by another observatory. Why bother? Well, scientists now have additional observations that show the slow movement of the planets around their parent star. Knowing the orbits of the extrasolar planets tells us a lot about those systems.
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Show 362: Mission Proposed for Uranus
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Nov 03, 2011
In 2011, the National Research Council named a mission to Uranus as the third priority behind a Mars sample return and a Jupiter Europa Orbiter. Imaged and studied close-up only once -- in 1986 by Voyager -- the planet was not as striking as its neighbors Jupiter and Saturn. But we have discovered more about this unique planet that makes it worth studying more closely.
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Show 360: HubbleWatch for October 2011
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Oct 27, 2011
Astronomers discover another moon around Pluto, the smallest body to yet be found around the Kuiper Belt object. And Hubble reaches its millionth science observation while studying the atmosphere of an extrasolar planet.
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Show 359: Location, Location
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Oct 27, 2011
Radio astronomers are keen to build the next big radio telescope, one that will probe deep into the universe, map the material between stars and galaxies, and hunt for emissions from new stars and planetary systems. The new telescope, called the Square Kilometer Array, will consist of thousands of antennae combined to collect radio waves. But where will this large facility be located? There are two contenders, an African consortium led by South Africa, and a team from Australia and New Zealand. The decision, to be made in 2012, may extend beyond cut-and-dried science and technology issues.
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Show 358: Origins of the Dinosaur-Killing Asteroid
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Oct 20, 2011
The source of the asteroid that killed off the dinosaurs and many other species 65 million years ago remains a mystery. Some researchers thought that the asteroid was the child of a much larger space rock that broke apart 160 million years ago. New research from NASA's WISE satellite seems to indicate otherwise.
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Show 357: More Planets
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Oct 13, 2011
Extra-solar planets abound. Each week, more planet discoveries are being reported, including those from NASA's Kepler mission and the European Southern Observatory's HARPS instrument. A planet that orbits two stars and a collection of Super-Earths -- planets with mass higher than Earth but lower than that of gas giants -- all were discovered recently. The number of extrasolar planets to date is about 690, but at this rate that won't be the case for long.
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Show 356: How Will ISS Fall to Earth?
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Oct 06, 2011
The recent crash-landing of a satellite brought a lot of attention. So what will happen when the much larger International Space Station comes down? NASA has planned for the station's eventual demise. Unlike the recent satellite, the ISS will be de-orbited in controlled way, with all its debris falling into the ocean.
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Show 355: HubbleWatch for September 2011
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Author: Carol Christian Author: &Author: Jim O'Leary
Fri, Sep 30, 2011
At the site of a supernova witnessed in 1987, the remnants of an exploded star are undergoing a transformation that astronomers are able to watch in detail for the first time. And new movies made from Hubble images taken over a span of 14 years show material shooting away from young stars and across space at supersonic speeds.
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Show 354: Black Hole Confirmed
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Author: Carol Christian Author: &Author: Jim O'Leary
Thu, Sep 29, 2011
Cygnus X-1 was the first object identified as a black hole. While many black holes have been detected, the distance to Cygnus X-1 has been determined just recently. Knowing that this object is comprised of two components -- an evolving blue supergiant and a dark companion -- and with the new distance determination, it appears that indeed the dark companion is a black hole. In addition, new observations suggest the long-term fate of the pair.
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