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421. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... As the comet approaches the Sun, that ice melts and even vaporizes. It boils off the comet head and the moving comet leaves it behind. ... Plus, there must be a large pocket of gas just under the surface of the comet. ... Finally, the tail is streaming off the comet head, but appears to be off to one side since the comet's motion around the Sun makes it leave behind that material. ...
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Ссылки http://www.badastronomy.com/bitesize/hbhoods.html -- 20.9 Кб -- 09.04.2016
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422. 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. The stars themselves don't seem to move at all among themselves, and it takes a keen eye to discern the motion of the planets, which takes days or weeks to become obvious. ... The same is true for light. ...
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Ссылки http://www.badastronomy.com/bitesize/doppler.html -- 23.2 Кб -- 09.04.2016
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423. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Slacker Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... For a long time no one was sure just what happened inside the core of a massive star when it uses up its fuel. ... Heat holds it up because for all its mass, the core of a star is still just a fancy type of gas, and a hot gas wants to expand. ... We call these kinds of stars white dwarfs because they are small and hot. ... 2008 Phil...
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Ссылки http://www.badastronomy.com/bitesize/chandra.html -- 20.4 Кб -- 09.04.2016
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424. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Site Info . ... In past snacks, I have talked about how the Moon's orbit is an ellipse, and how this effects our view of the Moon. ... But a much simpler effect is that because the Moon has an elliptical orbit, sometimes the Moon is closer to the Earth than other times. ... Antonio Cidadao, whose images have graced these Bitesized pages in the past , has once again made a stunning image using relatively simple equipment. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/bigmoon.html -- 19.6 Кб -- 09.04.2016
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425. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... The subject here is a relatively nearby star with the unassuming name of Beta Pictoris (commonly called "Beta Pic" for short). About 15 years ago, Beta Pic was found to be encircled by a nearly flat disk of dust, large enough to be resolved using ground based telescopes. ... One thing it can do is take very high resolution images, in a sense zooming in on the very inner regions of the disk around Beta Pic. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/betapic.html -- 23.2 Кб -- 09.04.2016
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426. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Movies for example: how many tens of millions of people saw the movie Armageddon in 1998, for example? That had more bad astronomy in it than any Bugs Bunny cartoon. ... Maybe it's because I work so closely with Hubble data and scientists that the errors I see about it in the public's eye loom so large. ... Actually that's part of why I am writing about this topic today: what happens to Hubble observations after the telescope points at some object? ...
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Ссылки http://www.badastronomy.com/bitesize/archive.html -- 22.4 Кб -- 09.04.2016
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427. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... The center of the elliptical galaxy M84 was observed using STIS to see if there was a giant black hole there (a wide view of the galaxy is seen on the left). ... Their huge gravity accelerates matter up to tremendous speeds, but only closer in to the actual black hole. The great resolution of Hubble combined with the spectrographic qualities of STIS allow it to look very close in to the center of the galaxy and look at the matter nearest the black hole. ...
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Ссылки http://www.badastronomy.com/bitesize/stism84.html -- 19.9 Кб -- 09.04.2016
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428. 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. ... I expressed skepticism of the result, as any scientist would, though I speculated on its impact. ... He showed that even though the Universe is accelerating, it is also closed. ... What we think of as ``closed'' means the Universe has a finite extent. Think of the surface of a balloon (a flawed analogy, but good enough for my purposes here). ...
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Ссылки http://www.badastronomy.com/bitesize/accel2.html -- 20.4 Кб -- 09.04.2016
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429. 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. ... I get the occasional email from someone interested in becoming a professional astronomer, asking for career advice. ... There are lots of people out there passionate about the sciences, but terrified that after years (and tens of thousands of dollars) of schooling, they may still not be able to get a job. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/career.html -- 23.3 Кб -- 09.04.2016
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430. Phil Plait's Bad Astronomy: Bitesize Astronomy
Blog . ... Bad Astronomy . ... Bulletin Board . ... Bitesize Astronomy . ... Site Info . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... As I reported back in February, the Space Shuttle Discovery installed new instruments on board the Hubble Space Telescope The two cameras, named NICMOS (for Near Infrared Camera and Multiobject Spectrometer) and STIS (for Space Telescope Imagine Spectrograph) . ... 2008 Phil Plait. ... Talk about Bad Astronomy on the BA Bulletin Board! ...
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Ссылки http://www.badastronomy.com/bitesize/stispr.html -- 18.2 Кб -- 09.04.2016
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431. 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. ... For a hundred years or so now we have looked at pictures of spiral galaxies and wondered at their beauty. ... The brightest stars will light up the clouds, making them visible. So when you see a "grand design" spiral, what you are really seeing are the gas clouds being lit by the bright stars that were formed as the clouds collide. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/spiral.html -- 19.6 Кб -- 09.04.2016
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432. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... 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. ... While doing some routine data analysis for for my work with STIS data , I ran across a star that had me baffled. ... I also labeled the stars the same way as in the STIS image. ... In that second image, you can see that the faint star is in about the right place, but the bright star is not even in STIS's field! ...
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Ссылки http://www.badastronomy.com/bitesize/proper.html -- 23.7 Кб -- 09.04.2016
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433. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... The Nine Planets . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... The sky can be a crowded place. As the Moon makes its stately orbit around the Earth once a month, there are a lot of objects which it passes along the way. ... It so happens that a handful of bright stars lie near the path on the sky that the Moon takes, and so the Moon does actually pass close to or even in front of stars every now and then. ...
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Ссылки http://www.badastronomy.com/bitesize/occult.html -- 20.3 Кб -- 09.04.2016
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434. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Site Info . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... The problem is, even though it's clear, it doesn't get dark. ... I visited an old campsite where I used to go to a summer camp. ... But there's something even more special about having people right there, standing under the starry vault, asking questions nonstop for an hour. ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! ...
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Ссылки http://www.badastronomy.com/bitesize/nimrod.html -- 20.3 Кб -- 09.04.2016
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435. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Dwingeloo 1 is a galaxy that's very close, yet no one saw it until pretty recently. ... Dwingeloo 1 is not alone in the cosmos; it is part of a close group of several galaxies. ... The galaxy group containing Dwingeloo 1 (actually, the group is named after the brightest member, IC 342) probably formed at the same time as the Milky Way, from a truly enormous cloud of hydrogen. ... Two large ones, orbiting each other, can pass a bit of that orbital energy to a smaller galaxy. ...
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Ссылки http://www.badastronomy.com/bitesize/maffei.html -- 20.9 Кб -- 09.04.2016
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436. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... From my vantage point, slumped in the chair, I saw a green blur of unidentifiable trees, passing me at about 100 kilometers an hour. ... I saw the tree covered with leaves, and thought: if those leaves were stars, how many trees will we pass before I see as many leaves as there are stars in the Milky Way? ... So instead of 90 days to pass as many leaves as stars in the Milky Way, it may only take 9. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/leaves.html -- 23.3 Кб -- 09.04.2016
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437. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... What better way than to use some simple equations to figure out the energy of an asteroid impact? When an asteroid or comet impacts the Earth, the size of the explosion depends on a lot of factors, but mostly on the mass of the impactor and the velocity of the impact. ... The energy released on impact will come up, in megatons. ... Mass and Impact energy: . ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/kaboom.html -- 21.6 Кб -- 09.04.2016
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438. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... What's the farthest distance you can see? Looking around during the day, chances are the farthest you can see is only a few kilometers. If you are up in a tall building, you might be able to see objects as much as 100 kilometers away. ... But if you look up , you can see for about 150 million kilometers! ... That's about 20 million million million kilometers away, or a 2 followed by 19 zeroes! ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/howfar.html -- 19.5 Кб -- 09.04.2016
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439. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Site Info . ... Hey, it's either this or one of those really irritating PayPal donation buttons here. ... Last month, in El Paso, Texas, the residents were stunned by a large explosion and flash of light over their city at 2:46 p.m. Although at first stories were confused, it turns out a smallish meteor burned up high in the Earth's atmosphere, exploding with the force of about a quarter ton of TNT. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/elpaso.html -- 19.2 Кб -- 09.04.2016
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440. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... Week of February 17, 1997 . Just a quick note for this week, since I was out all last week watching the Space Shuttle launch: . ... They had a completely successful mission, installing both NICMOS and STIS (check the Pantry at the bottom of this page, Week of Feb. 10, for more on them) as well as several pieces of hardware to improve Hubble's performance. ... The Space Telescope Science Institute has a page devoted to the mission. ... 2008 Phil Plait. ...
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Ссылки http://www.badastronomy.com/bitesize/deploy.html -- 18.5 Кб -- 09.04.2016
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