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2861. http://www.armaghplanet.com/pdf/AstroTopics/Observing/meteors.pdf
... Most sources say that this warming is due to friction between the meteoroid and the Earth's atmosphere, and that is partially true. ... Most meteoroids are smaller than a grain of rice" Meteors are the bright trails left by fragments of natural space debris called meteoroids (usually chunks of rock and iron) falling through the Earth's atmosphere. ... These are called meteorites. ... Belonging to a rare class of meteorite called pallasites, it was discovered locally by Steve Arnold. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Observing/meteors.pdf -- 156.6 Кб -- 20.09.2011
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2862. http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/Parallax.pdf
... After all we cannot send a probe to the star Altair to confirm that it is 17 light years away. ... The "Bessel determined that the star 61 Cygni was about ten light years away" Earth goes around the Sun in one year, so in six month it is in the opposite position in its orbit. ... In 1838 Bessel determined that the star 61 Cygni had a parallax of 0.314 arcseconds and therefore the star was about ten light years away (today the distance is more precisely measured to be 11.4 light years). ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/Parallax.pdf -- 102.6 Кб -- 20.09.2011
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2863. http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/cepheid.pdf
November 2006 Astronotes 1 Candles in the Dark Image Credit: Wikipedia.org By Colin Johnston, Science Communicator Since the mid-ninteenth century astronomers have used the principle of parallax to measure the distance to other stars. ... How then can we tell, for example, that M31, the galaxy in Andromeda, is 2.2 million light years away? It would be straight-forward to tell how far away a star was if it was exactly the same brightness as our own Sun. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/cepheid.pdf -- 78.9 Кб -- 20.09.2011
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2864. http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/hubble.pdf
December 2006 Astronotes 1 Hubble sees Red! ... Hubble did the maths and discovered that M31 was very distant indeed (2.2 million light years away is the accepted figure today), so far in fact that it must be a galaxy in its own right. ... M31 Andromeda Galaxy A Hubble Space Telescope view of the galaxy's core is now called Hubble's Law, and it made his name. ... If you measure the redshift of a galaxy, you will know its velocity, and by Hubble's Law, you will automatically know its distance away. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Measuring%20the%20Universe/hubble.pdf -- 134.1 Кб -- 20.09.2011
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2865. http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/The%20last%20men%20on%20the%20Moon.pdf
December 2007 Astronotes 1 The last men on the Moon by Alyson Kerr, Education Support Officer On 14th December 1972, the Apollo 17 crew finished 22 hours of rock and dust sampling and started the journey home. ... The famed Apollo lunar missions had finally ended. ... The crew of Apollo 17 knew that they would be the last to set foot Image Credit: NASA Apollo 17 crew Eugene A. Cernan, Ronald E. Evans and Harrison Schmitt pictured before the flight on the Moon's surface for many years. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/The%20last%20men%20on%20the%20Moon.pdf -- 214.7 Кб -- 20.09.2011
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2866. http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/oldest%20planetarium.pdf
... It is generally accepted that the mechanism, widely known as the Antikythera mechanism, was made in Rhodes at the height of the Roman Republic, as the island was known as the source of interesting mechanical automata. You can tell just by looking at it that the device is part of a larger object, and it is also obvious that there are geared wheels and other rotational elements within it. The device undoubtedly is an early computer and could be seen as the first planetarium. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/oldest%20planetarium.pdf -- 88.0 Кб -- 20.09.2011
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2867. http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/Mike%20Mckay.pdf
... More recently, as Flight Operations Director, he has been responsible for the operation of ESA's Lunar and Mars Missions, SMART-1 and Mars Express, which continue to deliver outstanding scientific results. ... He now runs ESA's Exploration Missions Office, and is responsible for the operation of ESA's future Space Exploration Programme, Aurora, covering robotic and eventually manned missions to the Moon and Mars. Mike is one of hundreds of engineers and scientists who make the ESA missions work. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/Mike%20Mckay.pdf -- 215.4 Кб -- 20.09.2011
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2868. http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/Copernicus.pdf
... In 1497 he moved to Rome, where he observed a lunar eclipse and gave lectures on astronomy and mathematics. "the Solar System was believed to have the Earth for the centre with the planets and Sun going around it" Copernicus came up with a theory called the Heliocentric hypothesis. For centuries the Solar System was believed to have the Earth at its centre with the planets, Moon and Sun moving around it. ... Copernicus wrote a short piece on his theory called `De Revolutionibus'. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/Copernicus.pdf -- 84.5 Кб -- 20.09.2011
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2869. http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/galileo.pdf
June 2007 Astronotes 1 Astronomy Greats: Galileo Image Credit: Portrait of Galileo Galilei by Justus Sustermans ca. 1639 (via Wikimedia) By Naomi Francey, Education Support Officer In a previous Astronotes I was explaining how all our rooms at Armagh Planetarium are named after famous Astronomers. ... Born in Pisa, Italy as one of seven children, he accomplished a great deal during his lifetime. ... NASA named one of their probes after Galileo and, like Galileo, it made many original discoveries. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/History%20and%20Biographies/galileo.pdf -- 69.5 Кб -- 20.09.2011
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2870. http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/Guide%20to%20the%20galaxies.pdf
... Galileo was one of the first to study our Milky Way with a telescope in 1610 and he discovered that it was composed of a huge number of faint stars. ... Image Credit: NASA Elliptical Galaxy This image from NASA's Hubble Space Telescope shows a good example of an elliptical galaxy at the centre of a galaxy cluster that is over 450 million light-years away in the direction of the constellation Centaurus. ... Then the Andromeda galaxy was first classed as a galaxy outside of our own Milky Way. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/Guide%20to%20the%20galaxies.pdf -- 108.9 Кб -- 20.09.2011
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2871. http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/Cosmic%20bullying.pdf
... STFC/JBO/MERLIN Fatal Beauty This composite image (about 180 000 light years across) shows the jet from the black hole at the centre of one galaxy striking another galaxy, the first time such an interaction has been found. ... The proximity of the two galaxies (around twenty thousand light years, about the same distance Earth is from the centre of the Milky Way) means that any planetary systems in the path of the deadly jet are likely to have been destroyed. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/Cosmic%20bullying.pdf -- 95.0 Кб -- 20.09.2011
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2872. http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/dark%20size%20of%20the%20universe.pdf
... The ideas of Dark Matter and Dark Energy are certainly revolutionary. ... What is Dark Energy? ... The galaxies are much more massive than expected and consist of matter we can detect and something else we can't see i.e. Dark Matter. ... How does Dark Energy fit into the evolution of the universe? ... The mutual gravitational attraction between this matter slows the rate of expansion Ї Once the universe is beyond a certain size Dark Energy, which is a repulsive force, forces galaxies apart. ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/dark%20size%20of%20the%20universe.pdf -- 72.5 Кб -- 20.09.2011
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2873. http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/drake.pdf
... This is perhaps the most common question asked by visitors to the planetarium. ... This is known as the Drake Equation and reads as follows: N = R* fp ne fl fi fc L N is the number of communicating civilizations in the galaxy R* represents the average rate of star formation in the Milky Way Galaxy fp is the fraction of those stars that have planets around them ne is the number of planets per star that are capable of sustaining life fl is the fraction of planets in ne where life ...
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Ссылки http://www.armaghplanet.com/pdf/AstroTopics/Beyond%20the%20Solar%20System/drake.pdf -- 93.5 Кб -- 20.09.2011
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2874. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-09.pdf
September 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER LHC update The Moon and the tides Red Square to Red Planet September night sky Still Impossible! ... The Moon is pulling at the oceans closest to it, causing a high tide whilst on the opposite side of the Earth the pull is weaker causing the oceans to bulge away from the Moon causing another high tide. ... Because the Earth rotates much faster than the Moon, the bulges move around the Earth about once a day giving two high tides per day. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-09.pdf -- 308.6 Кб -- 20.09.2011
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2875. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-08.pdf
August 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER Life, but not as we know it! ... ARMAGHPLANETARIUM 2 Astronotes August 2010 Life, but not as we know it! by Sinead McNicholl, Education Support Officer Recent press reports say scientists believe they may have found life on one of Saturn's moons called Titan. ... Solar eclipses occur when the Moon passes in between the Sun and the Earth. ... The Moon's shadow on the Earth A solar eclipse as viewed from the international Space Station in 2006. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-08.pdf -- 557.8 Кб -- 20.09.2011
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2876. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-07.pdf
... Ireland's monster telescope The sky this month Gravity: Apples and comets Target: Jupiter! ... The July night sky by Mary Bulman, Education Support Officer This is a wonderful time of the year to indulge in a bit of stargazing. ... In this image the COBE satellite shows the plane of our Galaxy in infrared light . ... Image Credits: Gravity Probe B Image Archives A warp in space-time The Gravity Probe B is a Joint Project between NASA and Stanford University, which was launched 20 April 2004. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-07.pdf -- 559.3 Кб -- 20.09.2011
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2877. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-06.pdf
June 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER Fire in the sky: the Aurora The LHC: a cause for conCERN? ... The best time to observe is the hours right before and after Aurora from space An image taken from a Space Shuttle showing the aurora in Earth's atmosphere. midnight. ... The Earth is so small." ... Every child I know has Moon Phases June 2010 Friday 4 June Saturday 12 June Saturday 19 June Saturday 26 June Last Quarter NEW MOON First Quarter FULL MOON CERN and the LHC: What are they? ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-06.pdf -- 776.3 Кб -- 20.09.2011
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2878. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-05%20.pdf
May 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER Uranus and Neptune: identical twins? ... However, a few hundred years later with improvements in technology and better understanding of our Solar System, how much do we actually know about these distant members of our Solar System? ... Although sometimes thought to be twins, Uranus and Image Credit: NASA, Blue planet An image taken from Voyager 2 spacecraft showing the stormy area known as the `Great Dark Spot' on Neptune. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-05%20.pdf -- 622.0 Кб -- 20.09.2011
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2879. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-04s.pdf
April 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER Into Cyberspace Measuring the Void (Part 2) April night Sky Houston, we've had a problem! ... Image Credit: NASA. ... Image Credit: NASA April 2010 Astronotes 9 that it was mentioned in a NASA press release. ... One example are the `trees' reported by some, Not such a pretty face Mars Express showed it to be a natural feature Image Credit: ESA 10 Astronotes April 2010 Express mission, which must say something about ESA's publicity machine. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-04s.pdf -- 404.9 Кб -- 20.09.2011
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2880. http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-03.pdf
March 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER Great balls of fire! ... The sky this month Measuring space Mars rocks! ... Million of meteors occur in the Earth's atmosphere everyday. ... An Image Credit: NASA, Apollo 8 reentry Artist's impression of the Apollo 8 capsule entering the Earth's atmosphere. ... NASA's Hubble Space Telescope has captured images of two colliding asteroids about 145 million km (90 million miles) from Earth. ... Image Credit: NASA/JPL March 2010 Astronotes 9 ment. ...
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Ссылки http://www.armaghplanet.com/pdf/Astronotes/Astronotes2010/Astronotes%202010-03.pdf -- 1419.0 Кб -- 20.09.2011
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