Category Archives: Physics

The Pale Blue Dot & Beyond

Gestern habe ich eine Folge von Mensch Otto Bayern 3 gehört, in der Thorsten Otto die Astrophysikerin Lisa Kaltenegger interviewt:

Mensch Otto, Sendung vom 05.11.2015 mit Lisa Kaltenegger (MP3).

“Ihre Spezialität sind Exoplaneten, Exomonde und Supererden. Was dem einen völlig Spanisch vorkommt, ist für die österreichische Forscherin die große Leidenschaft. Für sie ist das Weltall ein einziges Geheimnis, das es zu entschlüsseln gilt. Und eine der spannendsten Fragen ist für sie, ob wir Menschen allein im Universum sind. „Jetzt, in diesen Jahren, ist die Technologie so weit, dass wir nach Planeten wie unserer Erde im All Ausschau halten können und Signale dieser Welten auffangen“, sagt Kaltenegger. Schon mit 27 Jahren forschte und unterrichtete die an der Harvard University, inzwischen arbeitet sie unter anderem für die NASA.”

Eingeladen wurde sie u. a. deshalb, weil wenige Tage zuvor ihr populärwissenschaftliches Buch Sind wir allein im Universum?: Meine Spurensuche im All erschienen ist.

Lisa Kaltenegger is Associate Professor of Astronomy, Director of the Carl Sagan Institute at Cornell University. The Carl Sagan Institute, aka Institute for Pale Blue Dots, …

“… was founded in 2015 at Cornell University to explore other worlds – how they form, evolve and if they could harbor life both inside and outside of our own Solar System. Directed by astronomer Lisa Kaltenegger, the Institute has built an entirely new research group, spanning 6 departments and including more than 20 faculty who focus on the search for life in the universe.”

Videos of the inauguration speeches by Lisa Kaltenegger, Ann Druyan, and others can be found here: (un)Discovered Worlds: Inauguration of the Carl Sagan Institute.

Kalteneggers talk A Thousand New Worlds is available on YouTube:

“Lisa Kaltenegger, director of the Carl Sagan Institute and associate professor of astronomy at Cornell, has been examining alien worlds for biosignatures–the pre-conditions and indications of life. Here she shares her research on potentially habitable planets beyond our solar system. Recorded July 8, 2015 as part of the School of Continuing Education and Summer Sessions summer lecture series.”

Astronaut meets Cartoonist

The Guardian: Chris Hadfield meets Randall Munroe: ‘Are we alone in the universe?’
“Chris Hadfield, the Canadian astronaut and internet sensation
Randall Munroe, the US cartoonist and former Nasa physicist

“The Canadian astronaut Chris Hadfield spent five months in 2012 and 2013 twirling around the Earth in command of the International Space Station. Hadfield guesses he made several thousand orbits of the planet during that time […]
The American artist Randall Munroe knows something, too, about capturing an audience in the age of the fast and fickle online share. Munroe’s webcomics, produced under the banner of xkcd and promising “romance, sarcasm, math and language“ , have for years been a part of the social media fabric.”

Great interview. I recently read An Astronaut’s Guide to Life on Earth and enjoyed it immensely. Also, Munroe’s explanation of orbital speed with the Proclaimer’s hit I’m gonna be (500 Miles) is great!

Link via MetaFilter:“When you looked down at Earth, did you always know where you were?”

It’s all relative

Washington Post: This high school student just won $250,000 for his film explaining Einstein’s theory of relativity.

“Ohio high school senior Ryan Chester became the inaugural winner of a new college scholarship on Sunday night, winning $250,000 for his 7-minute film that uses simple props and hand-drawn graphics to explain Einstein’s special theory of relativity.

Besides winning that money for himself, Chester also won $100,000 for a new science lab at his school in the Cleveland suburbs, North Royalton High, and $50,000 for his physics teacher, Richard Nestoff. […]

The scholarship is the newest award in the family of Breakthrough Prizes, which are meant to celebrate the importance of science and recognize brilliance in the fields of math, biology and physics. Founded three years ago by Silicon Valley giants […] the Breakthrough Prize offers awards ranging from $100,000 for promising early-career achievements to $3 million for scientists who have made fundamental discoveries about the world.”

IFL Science: Teenager Wins $400,000 For His Video Explaining Einstein’s Theory of Relativity.

Here’s the video on YouTube: Breakthrough Junior Challenge: Some Cool Ways of Looking at the Special Theory of Relativity, by Ryan Chester.

Hole-Punch Cloud

Fallstreak Holes

“A fallstreak hole, also known as a hole punch cloud, punch hole cloud, skypunch, canal cloud or cloud hole, is a large circular or elliptical gap that can appear in cirrocumulus or altocumulus clouds. Such holes are formed when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation (see supercooled water). When ice crystals do form it will set off a domino effect, due to the Bergeron process, causing the water droplets around the crystals to evaporate: this leaves a large, often circular, hole in the cloud.”

Deutsch: Hole-Punch Cloud.

I first stumbled upon this hole punch cloud, which was photographed in Korumburra, Australia, a few days ago. It has a sort of “rainbow” inside, which is explained in this National Geographic article from last year: Explaining Rare ‘Hole Punch’ Cloud With Rainbow in the Middle.

Here’s another great example, a sundog inside a hole-punch cloud (bigger version of the photo).

A Google image search finds lots of other great photos.