NASA scientists amazed by New Horizons' latest images of Pluto

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At Friday's press briefing, NASA scientists studying Pluto appeared to be giddy. What they once knew as only a yellowish blob is coming to life as a complex and fascinating world.

NASA unveiled more discoveries about Pluto from the data that's begun trickling back after this week's historic fly-by. Scientists who've waited their whole careers for a glimpse of that faraway dwarf planet say they had no idea how complex it would be.

"I'm a little biased, but I think the solar system saved the best for last," said Alan Stern, New Horizon's principal investigator, during Friday a press briefing.

VIDEO: Bay Area space buffs celebrate successful Pluto flyby


Based at NASA Ames in the Bay Area, geologist Jeff Moore has been picking apart the new images.

"I'm still having to remind myself to take deep breaths. I mean the landscape is just astoundingly amazing," Moore said. "We've discovered vast craterless plains with some strange story to tell."

The plains stand in stark contrast to icy mountains the size of the Rockies discovered earlier in the week. The lack of craters means they're young, formed either by movement beneath Pluto's surface, or by erosion.

"Creating kind of the same sorts of patterns you see when you look at the surface of a boiling pot of oatmeal, or like the blobs in a lava lamp," Moore added.

As the New Horizons spacecraft drifts farther from Pluto, it's looking back at it to measure its atmosphere. Scientists say the atmosphere is escaping from the dwarf planet's weak gravity.

"And so what we see behind Pluto is a tail, an ion tail of this ionized escaping atmosphere that's being pulled away, carried away in the solar wind," said Fran Bagenal, New Horizons' co-investigator.

NASA's New Horizons flies by Pluto


They've discovered wind currents near the surface are mild, around 10 miles an hour, and they'll learn more as the data pours in.

"And we're really looking forward to getting that data in a moth or two, but it's really tantalizing right now and we're able to do science with it," Moore said.

In fact, what scientists have now is merely a preview of what's to come.

"We currently have on the ground less than one of those 50 gigabits," Stern said.

It's been enough to incite the public's imagination. Pluto is social media's newest star.

"I think Pluto's becoming a brand. It sort of sells itself and we don't really have to work all that hard," Stern said.

There is lots of hard work to do as that data trickles in. They hope to learn more about what the ice on Pluto's surface is made of and just how cold it really is. It's been estimated at negative 369 degrees Fahrenheit.

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