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  • ...:// About the Video Room]
    3 KB (437 words) - 21:14, 1 January 2019
  • Before we begin, there's a necessary cautionary warning about the Sun: ...tance of 1 meter from the hole to the screen you are projecting on, a hole about 2 mm in diameter will work well. A size between 1/16th inch and 1/8th inch
    11 KB (2,030 words) - 06:03, 28 January 2014
  • ...there are over 100 million rods and 6.5 million cones in a typical retina, about 100,000 per mm2. The telescope is 8 inches (about 20 centimeters) in diameter. In perfectly still air under
    22 KB (4,196 words) - 08:13, 30 January 2013
  • ...s. Earth goes around the Sun twice as fast as Mars, lapping the Red Planet about every two years. Both planets have elliptical orbits, so their close encoun ''3. When is the next opposition of Mars, and about how many days are there from one opposition to the next?''
    15 KB (2,643 words) - 03:34, 23 October 2013
  • First, there are a few things you need to know about using Stellarium. You might look at the Stellarium [http://www.stellarium. ...he sky as it is now, and you may run the clock forward or set the time for about an hour after sunset to see the night sky for the current season. In this
    19 KB (3,198 words) - 04:22, 12 August 2017
  • ...n the data set, taken on the night of October 5, 2010, at about 15:50 UTC (about 1:50 AM) by Dr. Rhodes Hart. Each one is a 30 second exposure -- short by The Tarantula Nebula is about 170,000 light years away, in another galaxy. It's as far as our telescopes
    17 KB (3,096 words) - 02:12, 3 October 2015
  • ...ittle ellipse in the sky about 1/1.3 arcseconds in semimajor axis, that is about 2/1.3 arcseconds across. As you will see soon, this is a very very small an exactly the measured brightness at each pixel in the image, information about how the image was recorded, and a calibration that converts the position in
    13 KB (2,346 words) - 07:38, 17 November 2015
  • The light sensitive area is the square about 1 cm on a side. It is under a protective glass cover, and attaches to the ...oss. When a photon (a light particle) arrives near one of these, there is about a 50% chance that it will excite an electron that will be trapped in the pi
    16 KB (2,898 words) - 07:14, 8 March 2016
  • ...Why would you like to see this object, and what would you like to learn about it that a telescope image or measurement could reveal? and you are encouraged to explore it to see about the observatories and their telescopes. The content is currently under deve
    18 KB (3,102 words) - 21:16, 1 January 2019
  • about the range of of about 540 nm. An alternative unit is called the Angstrom, just
    12 KB (2,045 words) - 03:24, 28 August 2012
  • ...ded to 0.534 seconds of arc, and most of the light is within two pixels or about 1 second of arc. That is typical of a ground-based large telescope unless i ...what the reference time was though if you are interested you can read more about "unix time" here. You can convert this number to a date and time you are u
    20 KB (3,476 words) - 05:51, 12 November 2016
  • Look at what is available, think about what you asked for, and decide what question you want to explore. If you d
    7 KB (1,247 words) - 21:19, 1 January 2019
  • ...that are close (on a cosmological scale) to the much richer Virgo Cluster. About 40 to 80 million light years away from us, in a direction not far from the and read about it on Wikipedia:
    19 KB (3,387 words) - 14:12, 5 April 2016
  • an insulated metal box about 15 inches on a side. A large window on the to about -78 C. The pan is covered with
    11 KB (1,899 words) - 14:18, 19 November 2013
  • an iron ball about 1 foot in diameter from a wire 67 meters (220 feet) long. The ball could ea Find a piece of string about a meter long (a meter is 40 inches). Tie one end of it to a weight of
    10 KB (1,742 words) - 00:01, 8 January 2012
  • ...cist-explains-why-parallel-universes-may-exist Interview with Brian Greene about Fabric of the Cosmos] Delightful reading about A Short History of Nearly Everything, a Book by Bill Bryson]
    4 KB (604 words) - 04:06, 12 August 2017
  • <center>'''You know about ZODIAC CONSTELLATIONS'''</center> ...Iraq thousands of years ago, precession has shifted the constellations by about a month. So the constellation you were born under is probably the sign for
    10 KB (1,676 words) - 23:34, 7 January 2012
  • ...On this scale, the thin gas between stars may reach a temperature of only about 3 K. The Earth would be that cold too, except for some heat left over from ...anced by energy flowing out of its interior. '''Sunspots''' are cooler, at about 4500 K, because energy flow into them is blocked by a strong local magnetic
    26 KB (4,226 words) - 18:46, 23 January 2012
  • ...t hunts for food melts due to global warming. In 1996 the rate of loss was about 100 cubic kilometres per year. Ten years on, that loss has doubled. Polluti
    966 bytes (166 words) - 22:29, 16 January 2012
  • ...arth and in space are the astronomer's primary tools to gather information about the universe. You are probably familiar with small telescopes and binocular ...ts extrordinary discoveries. It is in low orbit, circling every 96 minutes about 560 km above the Earth's surface, and beyond Earth's atmosphere. The Hubble
    9 KB (1,487 words) - 21:08, 23 January 2012

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