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The Planetary Society BlogBy Emily LakdawallaSpecial report by Bill Nye from the VEXAG MeetingSep. 2, 2010 | 14:01 PDT | 21:01 UTC
Is Venus the forgotten planet, or just one that's hard to figure out? Absorbing the presentations at the Venus EXploration Advisory Group (VEXAG) meeting in Madison, Wisconsin in the U.S. this week, I can tell you Venus is both. Many people around our world of space explorers seldom think about Venus. This is evidenced by the relatively small number of missions that have made the trip to the hot acid planet, and by the exiguity of basic facts about what goes on there. With Mars, it's a different story. When our robots arrive at the red planet, there's plenty to see and plenty of data to send back to us on Earth. Such is not the way with Venus, but perhaps it should be. Each presenter I spoke with was excited to be exploring Venus but generally suffering a little frustration. Imagine us, a spacefaring species that loves to wander and transmit images, relishing pictures of exotic lakes of ethane on a moon of distant Saturn, but not knowing if a planet much closer by, that shines romantic beams every evening brighter than any star, has volcanoes erupting on its surface. Venus is a hard target -- solid rock but a very difficult place to explore. Its clouds of sulfur compounds obscure a rocky surface so hot that the acid rain evaporates before it can get to the ground.
Whether the researchers were arguing about the isotopic evidence for and against volcanism, or whether they were brainstorming ways to get balloon gondolas to survive a whirlwind trip in the relatively warm though low-pH super-rotation of acidic winds aloft, they all share a concern about Earth on account of their fascination with Venus. The subtext of all the Venus talk is climate change on Earth.
Almost every paper presented carries with it concern about climate change back here on Earth. Using data gathered by Soviet spacecraft over 20 years ago, researchers are looking for evidence of lightning. Japanese scientists and spacecraft builders have Akatsuki en route to our clouded sister world. Named "Dawn," because that's when Venus is visible, it will fly into a brilliantly conceived orbit that will allow studies of the Venusian air, with light from both the planet's limb and cloud decks. Along with managing the passage of night and day, Akatsuki is in, not a surface-synchronized orbit, but a super-rotating cloud-synched route. And of course, European and North American explorers continually plan missions to know more about this hot old place. Tuesday night Sanjay Limaye, an old friend of the Society and the organizer of the event, arranged for a public talk. Several hundred people came to hear about Venus. Jan Smit from the University of Amsterdam spoke about the geologic boundary created by the Chixculub impact 65 million years ago. He showed that it is indeed the event that wiped out most of the ancient dinosaurs. He logically tied that mass extinction to climate changes on Earth, and then to climate change on Venus. David Grinspoon from the Denver Museum of Nature & Science was next, showing the audience the clear connections and lessons to be learned from the geology of Mars, Earth, and Venus. Climate change was once again his focus. Finally, I got up and did my best to entreat the crowd to take climate change seriously and develop new technologies and save the Earth -- save it for us, for us humans. For me, VEXAG was remarkable. Venus is our closest neighbor, yet we are not clear on what makes that world go round. Everyone at VEXAG would agree, we have to come up many more missions and methods worthy of the challenge above and beneath the clouds of Venus. Bill Nye
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On the other end is the observation that (IIRC) the comparatively dense atmosphere of Titan is rather a superrotator far up. Add another atmosphere to the mix.
Yes, Venus is by all appearances, to this layman, a worthy goal! I'm glad that it now gets more of the attention it deserves, and coincidentally that Planetary Society continues to push the boundaries.
Every day Hal Masursky would come in and look at what we had, and say, "Can you give me more reh-solution? I need more reh-solution!" We also joked that had Pioneer Venus been orbiting Earth, and its radar altimeter spot happened to land on the San Fransicso Peaks just North of where we were working, the point would have been thrown out as an outlier. Which gives you an idea of how coarse the resolution was.
I'm on my way to ISAS tomorrow (working on space science, not planetary), but maybe there's some material there about Akatsuki. Sounds like a very clever mission.
Climate change is real, and has been happening for billions of years. I personally don't know if we are experiencing global warming or global cooling, but am confident that the chemistry and thermodynamics of Earth's climate are far more complex than any hockey stick model.
I doubt the connection asserted between Chixculub and climate change on Venus. Perhaps your group wants to claim recent impacts on Saturn and Jupiter are effecting climate change on Terra and Venus?
Until George Bush and the Republicans are found habitating on Venus, you'll have a hard time getting the media to believe it. Perhaps Cap-and-Trade needs to be amended to include Carbon-Credits for Venus?
I really think you're onto something here. You should start a big press effort to get this big news out!