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381. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Hey, it's either this or one of those really irritating PayPal donation buttons here. ... Then it takes its time, letting its light crawl here from some ridiculous distance like hundreds of thousands of light years. That's not strictly true for every aspect of astronomy; roughly a few hundred tons of meteor dust falls to Earth every day , but that's the only thing from outer space that does come to us.) ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/stardust.html -- 22.0 Кб -- 09.04.2016
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382. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Site Info . ... Links . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... The AL is a collection of amateur astronomy clubs, and has a lot of good stuff on their site to read. ... Astronomy Magazine has some tips and background info on telescopes. My sister site has two articles on telescope buying here and here , with lots of links therein. ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! ...
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Ссылки http://www.badastronomy.com/bitesize/scopefaq.html -- 20.3 Кб -- 09.04.2016
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383. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... This time, for the next few weeks, I invite you to take a look at the Universe In Motion . ... The only motions we see easily are the rising and setting of the Sun, Moon and stars, but that is a reflection of our own Earth's rotation. ... Usually, these objects are so far away that the distance itself shrinks the apparent motion, the way distant mountains hardly seem to move at all even though you may be driving past them at 100 kilometers an hour. ...
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Ссылки http://www.badastronomy.com/bitesize/parallax.html -- 23.4 Кб -- 09.04.2016
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384. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Universe Today . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. Hey, it's either this or one of those really irritating PayPal donation buttons here. ... One of the biggest questions about neutrinos is whether they have mass or not. ... If these little guys have mass, then by the virtue of their numbers alone they may actually contribute significantly to the mass of the Universe, and that is a very big question indeed. ...
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Ссылки http://www.badastronomy.com/bitesize/neutrino.html -- 20.4 Кб -- 09.04.2016
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385. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Here's a question for you: if you were to place the Moon randomly anywhere in the sky, on average, how many stars would it cover up? ... We found that the sky is about 40,000 square degrees . ... The area of a circle is pi * radius^2, so the Moon's area is pi * (1/4)^2=0.2 square degrees. So the number of stars in an area the size of the Moon is 0.15 stars/square degree * 0.2 square degrees=0.03 stars per Moon area. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/moonstar.html -- 18.8 Кб -- 09.04.2016
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386. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... I have noticed a tendency the past couple of weeks for these Bitesized pages to be a bit of a bigger bite than when I originally started out. ... If it didn't rotate, we'd eventually see all sides of the Moon. ... The Moon's orbit is an ellipse, which means that when it is closer to the Earth it moves a bit faster, and slows down when it is farther away. ... The Moon is rocking a little as we see it here from the Earth. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/moonrock.html -- 20.3 Кб -- 09.04.2016
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387. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... The Earth spins on its axis about once every 24 hours. ... Someone standing on the Earth would see it go once around the sky every 24 hours, a reflection of the observer's own motion. ... To an observer on the Earth, this means the Moon is moving a bit faster than the apparent motion of the stars. This means the Earth has to spin just a bit more to "catch up" with the Moon. ...
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Ссылки http://www.badastronomy.com/bitesize/moonrise.html -- 20.1 Кб -- 09.04.2016
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388. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... This energy, as I'll show in a moment, comes from a tiny loss of mass in the Sun. ... In the Sun's core, it converts hydrogen into helium by nuclear fusion. ... The total mass converted to energy is a whopping 2 billion kilograms (4.4 billion pounds) every second! But , the Sun has a total of 2 x 10 30 kilograms of mass, or a trillion billion times as much as it converts to energy every second. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/massloss.html -- 20.3 Кб -- 09.04.2016
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389. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Site Info . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. Hey, it's either this or one of those really irritating PayPal donation buttons here. ... The big news in astronomy last week, which came as no surprise to most people, is that the supposed "Face" on Mars is nothing more than a large, naturally formed mesa. ... I have some passing knowledge of image analysis, having spent the past decade or so working with Hubble data. ...
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Ссылки http://www.badastronomy.com/bitesize/marsmesa.html -- 20.3 Кб -- 09.04.2016
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390. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... That means that the Sun, Earth and Mars were all roughly on the same line. ... Mars' orbit is roughly a circle, about one and a half times the diameter of Earth's orbit. if you draw a picture for yourself, you'll quickly see that the time when Mars is closest to Earth is when they both line up with the Sun. About six months from now, Earth will be on the opposite side of the Sun from Mars, and Mars will be as far away as possible. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/mars_opp.html -- 21.1 Кб -- 09.04.2016
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391. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... August 5, 9:00 a.m. EDT : Prospector definitely impacted the Moon! ... On March 5th, 1998, however, the Prospector scientific team announced their big result: they had measurements that indicated there might be frozen water on the Moon. ... So the Prospector impact might make a splash big enough to see. ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! ...
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Ссылки http://www.badastronomy.com/bitesize/lp_crash.html -- 24.1 Кб -- 09.04.2016
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392. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/jetplane.html -- 21.9 Кб -- 09.04.2016
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393. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. Hey, it's either this or one of those really irritating PayPal donation buttons here. ... Here at Bad and Bitesized Astronomy Central, I try not to be alarmist. ... In the Sunday, April 19 Washington Post , there was a report that a 38 by 5 kilometer (24 by 3 mile) chunk of the Antarctic ice shelf broke off. ... Is global warming the culprit? ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/iceshelf.html -- 19.6 Кб -- 09.04.2016
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394. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... How many times have you heard the phrases "escape from Earth's gravity" and "zero gravity"? ... Gravity goes on forever, and there is no place in the Universe where there isn't some gravitational force. Anything with mass has gravity. ... So there really is no place in the Universe where there is zero gravity, except in the annals of Bad Astronomy. 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/freefall.html -- 20.4 Кб -- 09.04.2016
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395. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... You can be very general (``on Earth'', or ``150 million kilometers from the Sun''), or very specific. ... As part of my daylife work, I was assigned the task to find out just where the Earth is at a given time. We need this because we are observing a target that pulses, and to time the pulses we need to know just where the Earth is in relation to the Sun. ... To understand the delay, we need a very good position for the Earth. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/earthpos.html -- 20.8 Кб -- 09.04.2016
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396. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Let me tell you about my friend Dan Durda. ... It was at the U of M that we became friends. ... We were unlikely friends; while we both loved astronomy and maybe had a tad bit less love for the physics classes we were taking, we were very different people. ... Back in 1987, I went to visit him during his first year of PhD study at Florida, and he was just starting to dabble into art...
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Ссылки http://www.badastronomy.com/bitesize/dandurda.html -- 20.2 Кб -- 09.04.2016
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397. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... A lot of problems in astronomy are very complex, so much so that we need to simplify them a bit to be able to get a handle on them. In most cases, the person trying to solve the problem makes a couple of simplifying assumptions, and works the problem out in that easier way. ... This image is a small portion of a Hubble Space Telescope image of stars in a globular cluster (called M15). ... I am used to bright stars being very massive. ...
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Ссылки http://www.badastronomy.com/bitesize/brightgc.html -- 20.0 Кб -- 09.04.2016
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398. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Week of January 11, 1999 The phrase "once in a blue moon" is a common one in English. ... A blue moon is not really blue, but actually is the name given to the second full Moon in the same month. ... If a blue moon happens in January, it means that the second full Moon happens very late in the month. ... Odder still, the full Moon will occur early in March, which in turn means March gets a blue moon as well as January, while February doesn't even get a full Moon! ...
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Ссылки http://www.badastronomy.com/bitesize/bluemoon.html -- 20.3 Кб -- 09.04.2016
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399. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Ceres, the largest asteroid in the solar system is about 900 kilometers in diameter. ... How many asteroids do you think there are larger than 100 meters across (0.1 kilometers)? ... Using the numbers he supplied, I calculated how many asteroids there are larger than 100 meters in diameter. ... A billion asteroids 100 meters across would occupy the same space as a single asteroid with a radius of the cube root of one billion times 100 meters. ...
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Ссылки http://www.badastronomy.com/bitesize/asteroid.html -- 20.1 Кб -- 09.04.2016
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400. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Fun Stuff . ... It's the same with black holes. A black hole is an object with so much mass squeezed into so tight a space that the escape velocity-- the velocity you would need to be able to get away from the black hole-- is higher than the speed of light. ... Anyway, the material in this disk orbits the black hole just like planets around the Sun: the closer in you get, the faster you orbit. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/accrete1.html -- 20.4 Кб -- 09.04.2016
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