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• Solar System Real Estate
  ...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 Moon
  ...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
• Solar Telescope
  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
• Mars
  ...nearest Earth. Since Earth orbits the Sun once a year, and Mars orbits in about 1.88 earth years (687 days), Mars and Earth are near one another only once Also, a Martian day is about 24 1/2 hours, and the planet's axis tilts 25° compared to Earth's 23° til
  15 KB (2,437 words) - 23:08, 23 July 2014
• Saturn and Extrasolar Planets
  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
• Comets, Asteriods, Meteors, and Meteorites
  ...han 200 years, originate in the Kuiper Belt. Halley's Comet, which returns about once every 76 years, is a short period comet. Halley's Comet which returns about every 76 years is a short period comet from the Kuiper Belt
  15 KB (2,387 words) - 03:17, 24 July 2014
• We Can See the Universe
  ...or], who follows Orion across the sky each winter night. The [http://space.about.com/od/stars/p/siriusinfo.htm brightest star] in our sky is '''Sirius''', o ...ne [http://en.wikipedia.org/wiki/Astronomical_unit astronomical unit] (AU) about 150,000,000 km or '''8 light minutes'''.
  18 KB (3,104 words) - 23:06, 27 February 2012
• Subatomic Particles
  ...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
• Death of Stars
  '''Small stars''', up to about 1.4 solar masses, collapse to become '''white dwarfs''' while quietly sendi ...nly enough of the star remains to form a neutron star ... but if more than about 2 times the mass of the Sun remains after the explosion, it collapses to be
  17 KB (2,924 words) - 00:04, 28 February 2012
• How to Measure Distances in the Universe
  ...those planets. The images of Saturn returned by the Cassini satellite take about 1 hour and 23 minutes to travel 1,300,000,000 kilometers to reach us. or about 150 million km, 93 million miles, 8.3 light minutes.
  19 KB (3,164 words) - 04:18, 6 March 2012
• The Universe is Expanding
  ...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
• Galaxies Near and Far
  about the origin of its unusual 5000 light year long jet of electrons.</center> ...the constellation Eridanus. It is over 100,000 light years across, and is about the same size as the Milky Way. It is unusual in that while it is a classic
  23 KB (3,692 words) - 07:56, 27 March 2012
• Special Relativity
  ...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
• General Relativity
  ...r instance, to send a satellite beyond Earth we have to give it a speed of about 11 km/s. To escape the solar system from Earth's orbit takes 42 km/s, but t ...Take all the mass of the Sun, put it inside a sphere just 3 km in radius (about 2 milies), and it would be a black hole.
  14 KB (2,446 words) - 17:56, 2 April 2012
• Variable Stars in Messier 3
  ...f it were seen at a distance of 10 parsecs, 32 light years. To learn more about RR Lyrae stars you can read the [http://en.wikipedia.org/wiki/RR_Lyrae Wiki
  16 KB (2,713 words) - 02:21, 3 October 2015
• Things Beyond Our Understanding - Dark Matter and Dark Energy
  ...e and always the same size, since at the time Hubble had not yet found out about redshifts. ...ide the observable universe (approximately 46.5 billion light years away). About 60 million years before the end, gravity would be too weak to hold the [htt
  15 KB (2,570 words) - 21:00, 9 April 2012
• The Story of the Universe
  ...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
• Measure a Nearby Supernova
  ...the supernova in M101 that in 25 days the supernova drops in brightness by about 1.5 magnitudes. Although we did not capture this one at its maximum, we
  10 KB (1,666 words) - 02:46, 4 October 2015
• Night Sky
  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
• Very simple Python
  ...ystem has been under development for a decade and is mature. You can read about it and even preview its capabilities on the web. Keep in mind if you decid ...docs.python.org/2/faq/windows.html "frequently asked question" (FAQ) page] about Python on Windows to help you at first, and also consult [http://docs.pytho
  18 KB (2,913 words) - 22:26, 7 July 2018

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