Top 10 David Grinspoon Quotes

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Last Updated on May 30, 2021

Know
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Nov 07, 2020

We don't know that Venus had oceans, but there's every reason to believe it did.

New
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Nov 07, 2020

I'm a strong advocate of new missions to Venus.

Nov 07, 2020

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.

Long
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Nov 07, 2020

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.

Nov 07, 2020

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.

Environmental
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Nov 07, 2020

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.

Factors
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Nov 07, 2020

Radiation is one of the important factors in evolution. It causes mutation, and some level of mutation is actually good for evolution.

Protection
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Nov 07, 2020

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.

Earth
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Nov 07, 2020

What I wonder most about the Anthropocene is not when did it start - but when, and how, will it end? Will it end? Or is it possible that our own growing awareness of our role on Earth can itself play a pivotal role in shaping the outcome toward one that we would desire?

Cognitive
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Nov 07, 2020

Now, humans have become a dominant force of planetary change and, thus, we may have entered an eon of post-biological evolution in which cognitive systems have gained a powerful influence on the planet.

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