David Grinspoon

It's quite possible there's as much lightning on Venus as on Earth. ”

There is a history of thinking about space science from an environmental ethics perspective. And part of what I want to do is turn that back and use that experience to see if it reflects how we think about the Earth. ”

I intend to apply the perspective of astrobiology, which is a deep-time way of looking at life on Earth, towards the question of the Anthropocene. What does the human phenomenon on Earth look like viewed from an interplanetary perspective? ”

What I'm interested in is the conversations going on about the Anthropocene and what it means to view ourselves as a part of Earth's geological history. ”

The reason you see so many volcanoes on Venus is partly due to the fact that there's virtually no erosion there. So on Venus, you're seeing features, some of which are hundreds of millions of years old on the surface. On Earth, we do not see any surface features nearly that old - you only see much more recent features. ”

Earth's biosphere gave birth to humans and our thoughts, which are now reshaping its planetary cycles. A planet with brains? Fancy that. ”

Part of the point of SETI has always been a search for answers about our own cosmic potential and destiny. If 'they' are out there, it means that there may be hope for us. ”

Earth is a stunningly lovely planet for so many reasons. Among these is the wondrous presence of curious, artful, inventive humanity. ”

Whenever I see a nighttime picture of Earth from space, with its glowing lights, I am stirred by its beauty. ”

Mars does not belong to 'America,' nor to Earth, nor to human beings. ”