Asteroids
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Last modified November 28, 2007 by Randy Russell.
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 morexAtmospheric 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 morexMassive 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 morexKansas 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.
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Eccentricity of an Orbit
Most objects in orbits move along an elliptical path. An ellipse is a shape that can be thought of as a "stretched out" circle or an oval. An ellipse can be very long and thin, or it can be quite...more
Elliptical Orbits
When one object is in orbit around another object, the orbit is usually an elliptical orbit. For example, all of the planets in our Solar System move around the Sun in elliptical orbits. An ellipse is...more
Asteroid Toutatis Passes Near Earth
An asteroid the size of a mountain passed close to Earth on September 29, 2004. How close? Not close enough to worry about, but close enough for astronomers to get a pretty good look at it. Asteroid Toutatis...more
Pluto demoted - no longer a Planet!
Pluto has been officially demoted from its status as a planet. The International Astronomical Union (IAU), at a meeting in August 2006, voted on their first "official" definition of a planet....more
What is a planet?
It may surprise you, but astronomers don't really have a good definition of a "planet". Because of this, Pluto is at the heart of a controversy about its status. Is Pluto a planet, or isn't it? Scientists...more
Meteors
Meteors are streaks of light, usually lasting just a few seconds, which people occasionally see in the night sky. They are sometimes called "shooting stars" or "falling stars", though they are not stars...more
Asteroid Toutatis
Toutatis is a very odd asteroid. It appears to be two asteroids that are either loosely stuck together, rolling around against each other, or orbiting very close to one another. The orbit of Toutatis crosses...moreShop Windows to the Universe
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