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Our Sun to be a steady source of light.
The Sun Observer's Guide by Pam Spence is a practical reference for how and why to view our nearest star. Though the uninitiated consider our Sun to be a steady source of light and heat, nothing could be further from the truth. Using the proper equipment with appropriate safeguards, viewers can watch a seething tempest. Changes can occur in a few short minutes or, with appropriate record keeping, changes can be seen to vary over decades. This book can start you making worthwhile observations.
European scientists recently announced that they had discovered the presence of methane in the atmosphere of Mars using the Mars Express spacecraft. They've had a chance to perform further research on the data now, and produced a map of methane concentrations around the planet. This map surprisingly overlaps a similar map of Mars that shows where its water is located. It could be that geothermal processes are feeding the water table, and venting out methane at the same time. A more exciting possibility is that bacterial life survives wherever there's water, and it's producing methane as a byproduct.
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