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  • First, there are a few things you need to know about using Stellarium. You might look at the Stellarium [http://www.stellarium. .... Set your location in the software, and check that sunset occurs at about the right time.
    13 KB (2,242 words) - 19:34, 2 September 2013
  • ...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
  • 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
  • ...olumn, and has one star per line. Each line contains specific information about the star, including cross-referenced catalog numbers, celestial coordinates
    10 KB (1,607 words) - 06:08, 10 April 2018
  • Suppose that we have a catalog of data containing information about astronomical objects, and we want to find the data in the catalog that are
    8 KB (1,310 words) - 05:47, 10 February 2015
  • ...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 (3,021 words) - 21:58, 13 February 2017
  • Look at what is available, think about what you asked for, and decide what question you want to explore. If you d
    7 KB (1,226 words) - 11:08, 19 November 2014
  • Saturn's axis is tipped about 27 degrees from the plane of its orbit, and most of the time we either look For more information about the Cassini-Huygens mission, visit [http://saturn.jpl.nasa.gov http://satur
    10 KB (1,544 words) - 04:30, 7 February 2012
  • ...tory/celsius_scale.html Celsius], which is hotter than Mercury even though about twice as far from the Sun. ...imes that at [http://apod.nasa.gov/apod/ap020527.html sea-level] on Earth, about that 1km deep under the ocean. does not make it very inviting. Despite thes
    16 KB (2,688 words) - 23:04, 23 January 2012
  • The mirror at the top inside of the tower is adjustable about a horizontal axis to provide small corrections of the image north-south. I ...ximately 40 cm in diameter on the floor below. At this size, the image is about 1/4 the brightness of direct daylight, and is an darkened corridor where it
    7 KB (1,183 words) - 21:20, 30 January 2012
  • ...e, relativity. It's the kind of relativity that Galileo and Newton thought about. ...fornia. In the laboratory its energy is about 50 billion "electron volts", about 4 billion times more energy than an electrons that come out of your car's b
    18 KB (3,017 words) - 18:48, 2 April 2012
  • 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
  • ...ons and the nuclei of the atoms. Yet if the star is too massive, more than about 1.4 times the Sun's mass, the pressure the electrons exert on one another i ...ust as in particle colliders at [http://public.web.cern.ch/public/en/About/About-en.html CERN] here on Earth, a machine we build to study the constituents o
    7 KB (1,208 words) - 22:24, 27 February 2012
  • ...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
  • ...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
  • 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
  • ...3.5 billion years, showing that the rate of impacts declined to a minimum about 400 million years ago, just when life on Earth flourished. Recently they we ...me it circles Earth. We can see by the Moon's phases that the lunar day is about 30 Earth days.
    14 KB (2,354 words) - 05:37, 22 February 2012
  • ...of galaxies. The Cosmic Background Radiation which we see today originated about 300,000 years after the beginning of time. and the regions of higher densit After 1 year, its temperature was about that in the center of a star like the Sun, 15,000,000 K, and it was cooling
    19 KB (3,169 words) - 18:22, 16 April 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
  • ...same. No matter how we make the measurement, we will find light moving at about 300,000 km/s. Multiply '''z''' by this speed, and you'll have that the velo ...effect has been studied with high precision. We find that galaxies recede about 70 km/sec faster for each '''megaparsec''' more distant they are. This is w
    5 KB (884 words) - 17:46, 19 March 2012

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