... The general term for these waves is "Electromagnetic Waves". ... ASTR1001 Wavelengths · Electromagnetic waves, while all travelling at the same speed, can have different wavelengths (the distance between the crest of one wave and the next). ... Red Light: Wavelength 700nm Green Light: Wavelength 550nm Blue Light: Wavelength 400nm Ultra-Violet Light: Wavelength 300nm ASTR1001 The Electromagnetic Spectrum · Electromagnetic waves can have any wavelengths at all: anywhere from picometres to light-years....

... Space Shuttle and Space Station Photographed Together . ... Usually, pictures of the shuttle, taken from space, are snapped from the space station. Commonly, pictures of the space station are snapped from the shuttle. How, then, can there be a picture of both the shuttle and the station together, taken from space? ... Seen with foreground and background stars along the plane of our Milky Way galaxy it lies some 8,000 light-years distant, toward the constellation Cepheus. ... August . ...

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... 2001 July 3 . Unusual Flashes Toward Globular Cluster M22 . ... Explanation: What is causing the unusual flashes behind globular cluster M22? This teeming ball of stars is the brightest globular cluster visible from Earth's northern hemisphere. M22 , shown in full in the inset, spans about 50 light-years and lies 8,500 light-years away toward the constellation of Sagittarius . ... Behind M22 are many more stars near the center of our Galaxy . ... About APOD | ...

... Jitter is usually very small in magnitude and random in effect, and is not expected to lead to systematic throughput changes. ... However, such a change should lead to an obvious decline in the strength of the comparison lines at one end of the spectrum relative to the other and not an overall decline in counts. No such effect is seen (the counts decline evenly from one end of the spectrum to the other). ... The value changes steadily, but not by enough to account for the changes in counts seen. ...

... Observers looking at an object that is moving away from them see light that has a longer wavelength than it had when it was emitted (a redshift), while observers looking at an approaching source see light that is shifted to shorter wavelength (a blueshift). ... By measuring the amount of the shift to the red, we can determine that the bright galaxy is moving away at 3,000 km/sec, which is 1 percent of the speed of light, because its lines are shifted in wavelength by 1 percent to the red. ... Part 2...

. Album : asv-album :: Travels to distant places and countries :: 1998/05 Boston (USA) :: 4 Harvard . Up . << Prev . Unusual combination of stained glass window and vines . Next >> . Created with the tool album from David Madison 's MarginalHacks on Tue Jun 23 14:46:44 2015 .

... The awsome spectacle of a brilliant comet, with its long ghostly tail streaming behind it, is a rare event. ... Only one other comet, Comet Halley, was seen so far from the Sun, giving scientists an opportunity to watch it as it slowly warmed up and sprouted a tail. ... Comets are the Rip Van Winkles of the solar system -- mini-worlds that have changed little during their 4.5-billion-year nap far from the Sun. ... Observing Comets . ... Once, comets inhabited the entire solar system. ...

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 di