Phrase by 'David Grinspoon'
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I'm a strong advocate of new missions to Venus.
Author: David Grinspoon - American ScientistNew , Strong , Advocate , Venus
As a young planet, Venus was losing hydrogen rapidly to space. The oceans boiled off, and after some period of time, perhaps 600 million years, there was no surface water.
Author: David Grinspoon - American ScientistTime , Losing , Space , Water
Earth is going to lose its oceans in the future, just as Venus did in the past. How long planets retain their oceans is a function of distance from the sun, all other things being equal.
Author: David Grinspoon - American ScientistLong , Past , Future , Sun
I'm an astrobiologist, and I come from a planetary science background, so in a very broad sense, I study the evolution of planetary environments.
Author: David Grinspoon - American ScientistScience , Background , Study , Evolution
I do comparative studies of climate evolution, and the interactions between planetary atmosphere and surfaces and their radiation environment, and try to understand the environmental factors that can affect a planet's habitability and how they change over time.
Author: David Grinspoon - American ScientistTime , Understand , Change , Environmental
Mars does not have an atmosphere and does not have a magnetic field today, so the planet doesn't have the protection from radiation that our atmosphere and magnetic fields provide us on Earth.
Author: David Grinspoon - American ScientistToday , Us , Earth , Mars
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