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Archive for the ‘Physics’ Category

Light Pillars!

When it get really cold up here in The Great White North…

Amazing things happen!

light-pillars(Image Credit: Jay Callaghan)

Light pillars captured in Peterborough, Ont., on Feb. 24, 2014!

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light pillar is a visual phenomenon created by the reflection of light from ice crystals with near horizontal parallel planar surfaces. The light can come from the Sun (usually at or low to the horizon) in which case the phenomenon is called a sun pillar or solar pillar. It can also come from the Moon or from terrestrial sources such as streetlights (Wikipedia)

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This Week in Science (January 24, 2014)

Yes, boys and girls, geeks and nerdlings… scientists the world over have come up with some pretty neato stuff this week!

jan-26-2014

Excellent stuff, for sure!

Read more at the links below!

Black holes: http://bit.ly/M1dPva
Mantis shrimps: http://bit.ly/1n2GT3N
Cancer genome: http://bit.ly/1ggGtGv
Dolphin: http://bit.ly/1e7ZB6l
Cosmic web: http://bit.ly/M1eeh9
Supernova: http://bit.ly/M1e610
Shark extinction: http://bit.ly/1cj0TLp
Ceres: http://bit.ly/1fghjF4

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I know it’s stupid. I know it’s childish and nerdy but…

This cracks me up.

gravity-put-down

I mean, really.

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What if the polar ice caps melted. What would the world look like?

polar-icecap-melt

This National Geographic maps gives some indication as to how our world would change.

(Spoiler Alert: Goodbye Netherlands, Florida, the entire U.S. Eastern Seaboard and Bangladesh!)

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The coldest place on earth.

Antarctica. August 10, 2o1o and July 31, 2o13.

coldestplace

-135.8F (-93.2C)!

Mighty brisk, I can tell you that right now.

Puts things in perspective.

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The geeks and nerdlings over at ScienceDaily.com have once again failed to disappoint!

How Common Are Habitable Planets? One in Five Sun-Like Stars May Have Earth-Size, Potentially Habitable Planets

Yes, boys and girls, we may not be the ‘one of a kind’ world we once thought!

It seems there are a whole bunch of Earth-size planets out there. And by ‘a whole bunch,’ I mean several tens of billions. That’s getting up there, for sure.

The article begins, “NASA’s Kepler space telescope, now crippled and its four-year mission at an end, nevertheless provided enough data to answer its main research question: How many of the 200 billion stars in our galaxy have potentially habitable planets?”

The article continues, “Based on a statistical analysis of all the Kepler observations, University of California, Berkeley, and University of Hawaii, Manoa, astronomers now estimate that one in five stars like the sun have planets about the size of Earth and a surface temperature conducive to life. Given that about 20 percent of stars are sun-like, the researchers say, that amounts to several tens of billions of potentially habitable, Earth-size planets in the Milky Way Galaxy.”

Before we start jumping into our silver Flash Gordon outfits, let’s keep one thing in mind… Earth-size does not automatically mean habitable!!

habitable-planets(Credit: Petigura/UC Berkeley, Howard/UH-Manoa, Marcy/UC Berkeley)

The team cautioned that Earth-size planets in orbits about the size of Earth’s are not necessarily hospitable to life, even if they reside in the habitable zone around a star where the temperature is similar to that on our planet.

Yes, habitability is a fairly important factor when we’re talking about Earth-like planets. We have to take the Goldilocks Approach. Some are too hot, some are too cold… and some are just right!

“Some may have thick atmospheres, making it so hot at the surface that DNA-like molecules would not survive. Others may have rocky surfaces that could harbor liquid water suitable for living organisms,” Marcy said. “We don’t know what range of planet types and their environments are suitable for life.”

“The primary goal of the Kepler mission was to answer the question, ‘When you look up in the night sky, what fraction of the stars that you see have Earth-size planets at lukewarm temperatures so that water would not be frozen into ice or vaporized into steam, but remain a liquid, because liquid water is now understood to be the prerequisite for life?'” the researchers said. “Until now, no one knew exactly how common potentially habitable planets were around sun-like stars in the galaxy.”

A bit of a side-note here. Amazing scientists are usually lumped together and tagged with general labels like ‘scientists,’ ‘researchers,’ ‘the team’ or, my personal favourite, ‘the study says.’

Let’s take a minute to give credit where credit is most certainly due.

  • Erik Petigura, UC Berkeley graduate student  who led the analysis of the Kepler data.
  • Andrew Howard, a former UC Berkeley post-doctoral fellow who is now on the faculty of the Institute for Astronomy at the University of Hawaii; and
  • Geoffrey Marcy, UC Berkeley professor of astronomy.

These really smart and hard-working men, will publish their analysis and findings this week in the online early edition of the journal Proceedings of the National Academy of Sciences.

Well done, gentlemen. Well done.

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Journal Reference:
Erik A. Petigura, Andrew W. Howard, and Geoffrey W. Marcy.
Prevalence of Earth-size planets orbiting Sun-like stars.
PNAS, November 4, 2013 DOI: 10.1073/pnas.1319909110

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Night on a Spooky Planet Explanation: What spooky planet is this? Planet Earth of course, on the dark and stormy night of September 12 at Hverir, a geothermallyactive area along the volcanic landscape in northeastern Iceland. northern-lights-steam-iceland(Image Credit & CopyrightStéphane Vetter (Nuits sacrées) Geomagnetic stormsproduced the auroral display in the starry night sky while ghostly towers of steam and gas venting from fumaroles danced against the eerie greenish light. Tonight, there is still a chance for geomagnetic storms triggered by recent solar activity, so high-latitude skygazers should beware. And ghostly shapes may dance in your neighborhood, too.

I hope you all had a safe and Happy Halloween!

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