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08 May 2010
Astronomy Without A Telescope – Bringing the Planetology Home
We keep finding all these exoplanets. Our detection methods still only pick out the bigger ones, but we're getting better at this all the time. One day in the not-too-distant future it is conceivable that we will find one with a surface gravity in the 1G range – orbiting its star in, what we anthropomorphically [...]
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20 February 2010
Ozone on Mars: Two Windows Better Than One
Understanding the present-day Martian climate gives us insights into its past climate, which in turn provides a science-based context for answering questions about the possibility of life on ancient Mars. Our understanding of Mars' climate today is neatly packaged as climate models, which in turn provide powerful consistency checks – and sources of inspiration – for [...]
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30 November 2009
An astronomical perspective on climate change
Ice cores and deep sea bed cores provide the best available record of changes in global temperature and CO2 content of the atmosphere going back 800,000 years. The data shows a clear periodicity in global temperatures which is thought to be linked to the Milankovitch cycle. (...)Read the rest of An astronomical perspective on climate change [...]
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27 July 2009
Declassified Ice Loss Images
Last week the US government released more than a thousand intelligence images of Arctic ice that have been used to help scientists study the impact of climate change. The images were taken by spy satellites, as part of the Medea program, which lets scientists request spy pictures from environmentally sensitive locations around the world. [...]
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26 June 2009
Past Climate Change Cannot Be Tied to Earth Passing Through Galactic Plane
Earth's climate has changed over time, but the cause for the changes has been hotly debated. One idea (Shaviv and Veizer,2003), suggested that perhaps two-thirds to three-fourths of the variance in Earth's temperature over the past 500 million years may be attributable to when our solar system passes through the [...]
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18 June 2009
More Atmospheric CO2 Today Than in the Past 2.1 Millions Years
Researchers have been able to determine the atmospheric carbon dioxide levels over the past 2.1 million years in the sharpest detail yet by analyzing the shells of single–celled plankton. Their findings shed new light on CO2's role in the earth's cycles of cooling and warming, confirming many researchers' suspicions that higher carbon dioxide levels [...]
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