Current Events

  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
  • Massive Tornado Outbreak on Tornado Alley
    The week of May 19 brings dozens of tornadoes to Tornado Alley in the states of Oklahoma, Kansas, Io...Read more

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    Massive Tornado Outbreak on Tornado Alley

    The week of May 19 brings dozens of tornadoes to Tornado Alley in the states of Oklahoma, Kansas, Iowa, Illinois and Missouri. On May 20th, a massive tornado struck Moore, Oklahoma, devastating communities - destroying over 100 homes and hitting two elementary schools and a hospital - with many casualties and deaths. Our thoughts are with our friends and colleagues suffering from these storms. For more on the May 20th storms, see the NOAA Storm Prediction Center Storm Report.
  • Kansas Legislator Proposes Bill to Outlaw Sustainability Education
    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of ...Read more

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    Kansas Legislator Proposes Bill to Outlaw Sustainability Education

    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of sustainability. Here is a link to the one-page bill: http://www.kslegislature.org/li/b2013_14/measures/documents/hb2366_00_0000.pdf. See report on Bloomberg News.

Uranus Statistics

Planetary Symbol: Name in Roman/Greek Mythology: Uranus/Uranus
Diameter: 51,488 km (32,000 miles) Rotation Period about Axis: 17.24 hrs (retrograde?)
Mass: 86.8x10^24 kilograms (14.5 x Earth's) Revolution Period about the Sun: 84 years
Density: 1,270 kg/m^3 Tilt of Axis: 98o (or 82o?)
Minimum Distance from Sun: 2.7 billion km
(1.7 billion miles)
Surface Gravity: 8.69 m/s^2 (0.89 x Earth's)
Maximum Distance from Sun: 3 billion km
(1.87 billion miles)
Temperature at Cloud Tops: -200o C ( -328o F)
Orbital Semimajor Axis: 19.19 AU (Earth=1 AU) Average Cloud Top Temperature (K): 73K
Minimum Distance from Earth: 2.57 billion km
(1.6 billion miles)
Satellites/Rings: known moons, faint rings

Uranus Image Archive

Comparative Planetary Statistics -- in table form

Comparative Orbital Statistics -- in table form

Actual Distance to Earth

Last modified May 5, 2003 by Randy Russell.

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Myths about Uranus

Uranus, which was discovered by William Herschel in 1781, was unknown in ancient times. Astronomers decided to continue the practice of naming planets after deities in Greek and Roman mythology, so named...more

What are the retrograde motions of planets in the sky?

It depends on what kind of motion you are talking about. When seen from the north pole of the celestial sphere all planets orbit around the Sun in a counter-clockwise or direct path. Most planets also...more

Uranus' Moons and Rings

Uranus has // Call the moon count function defined in the document head print_moon_count('uranus'); fascinating moons and a complicated ring system. The ring system is a completely different form of ring...more

How far is the Earth from the Sun, the Moon and all the other planets? How far are all of the planets from the Sun? Do you know of a software that tracks the planets in real-time?

There is a really neat internet program called Solar System Live that shows the position of all of the planets and the Sun for any given day. If you go to that page, you'll see an image similar to the...more

An Overview of Uranus' Atmosphere

The bland aquamarine face of Uranus bears witness to the fact that Uranus is enshrouded in clouds. The planet appears to be blue-green because the atmosphere absorbs the red wavelengths of the visible...more

An Overview of Uranus' Interior

The Giant planets do not have the same kind of structure inside that the terrestrial planets do. Their evolution was quite different than that of the terrestrial planets, and they have much more gas and...more

The Poles of Uranus

Uranus is the tilted planet. Its spin axis, which defines the locations of its North and South Poles, is tilted almost 98° away from the "upright" direction perpendicular to its orbital plane. In other...more

An Overview of Uranus' Atmospheric Evolution

Atmospheres of the giant planets have definitely evolved from their formation out of the primitive solar nebula. How much they have evolved remains to be seen, however. Because of their enormous gravity,...more

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