The Ottumwa Courier

Community News Network

April 22, 2013

Slate: 15 facts about our planet

(Continued)

6. There is no physical place where Earth's atmosphere stops and space begins; the air just gets thinner and thinner and eventually fades away. But we love definitions, so the official height above the Earth's surface considered to be where space begins — called the Kármán line — is at an altitude of 100 km. Anyone who gets higher than that is considered an astronaut.

7. The Moon's radius is about 1/4 that of the Earth's, making it the largest satellite compared to its parent planet. Charon, Pluto's biggest moon, is about half the diameter of Pluto itself. So if you don't consider Pluto a planet, the Earth and Moon win.

8. The Moon is farther away from Earth than you think. As an analogy, if the Earth were a basketball, the Moon would be the size of a tennis ball 7.4 meters (24 feet) away.

9. The Earth's atmosphere is only transparent to a narrow slice of the electromagnetic spectrum. What we call visible light (mostly!) gets through, but most flavors of infrared, ultraviolet, X-rays and gamma-rays are stopped cold. Those last few are dangerous to life as we know it, so that works out well. But it's not a coincidence: if our air didn't protect us, we'd have evolved differently.

10. The Earth is warming up. It's a fact. Deal with it.

11. Fewer than 200 impact craters have been cataloged on Earth. The Moon has billions. We'd have just as many, but our air and water erode them over time, erasing them. Old craters on the Earth are hundreds of millions of years old; on the Moon those would be considered young.

12. An asteroid, 2010 TK7, shares an orbit with the Earth. It's about 300 meters (1000 feet) across, and never gets close enough to us to be a danger.

Text Only
Community News Network
  • Dangerous Darkies Logo.png Redskins not the only nickname to cause a stir

    Daniel Snyder has come under fire for refusing to change the mascot of his NFL team, the Washington Redskins. The Redskins, however, are far from being the only controversial mascot in sports history.  Here is a sampling of athletic teams from all areas of the sports world that were outside the norm.

    July 28, 2014 3 Photos

  • 'Rebel' mascot rising from the dead

    Students and alumni from a Richmond, Va.-area high school are seeking to revive the school's historic mascot, a Confederate soldier known as the "Rebel Man," spurring debate about the appropriateness of public school connections to the Civil War and its icons.

    July 28, 2014

  • Fast food comes to standstill in China

    The shortage of meat is the result of China's latest food scandal, in which a Shanghai supplier allegedly tackled the problem of expired meat by putting it in new packaging and shipping it to fast-food restaurants around the country

    July 28, 2014

  • wd saturday tobias .jpg Stranger’s generosity stuns Ohio veteran

    Vietnam War veteran David A. Tobias was overwhelmed recently when a fellow customer at an OfficeMax store near Ashtabula, Ohio paid for a computer he was purchasing.

    July 28, 2014 1 Photo

  • Screen Shot 2014-07-28 at 1.33.11 PM.png VIDEO: High-dive accident caught on tape

    A woman at a water park in Idaho leaped off a 22-foot high dive platform, then tried to pull herself back up with frightening results. Fortunately, she escaped with only a cut to her finger.

    July 28, 2014 1 Photo

  • How spy agencies keep their 'toys' from law enforcement

    A little over a decade ago, federal prosecutors used keystroke logging software to steal the encryption password of an alleged New Jersey mobster, Nicodemo Scarfo Jr., so they could get evidence from his computer to be used at his trial.

    July 25, 2014

  • Russia's war on McDonald's takes aim at the Filet-o-Fish

    Russia said earlier this week that it had no intention of answering Western sanctions by making it harder for Western companies to conduct business in Russia.
    But all bets are off, apparently, when you threaten the Russian waistline.

    July 25, 2014

  • cleaning supplies Don't judge mothers with messy homes

    I was building shelves in my garage when a neighbor girl, one of my 4-year-old daughter's friends, approached me and said, "I just saw in your house. It's pretty dirty. Norah's mommy needs to clean more."

    July 25, 2014 1 Photo

  • Arizona's prolonged lethal injection is fourth in U.S. this year

    Arizona's execution of double-murderer Joseph Wood marked the fourth time this year that a state failed to dispatch a convict efficiently, according to the Constitution Project, a bipartisan legal group.3

    July 24, 2014

  • Police Brutality screen shot. Technology plays key part in battling police brutality (VIDEO)

    Allegations of police brutality are nothing new -- as long as there has been law enforcement, citizens have registered claims that some officers cross the line. But in the last few years, the claims of excessive force are being corroborated with new technology from cell phone cameras, police dash-cams and surveillance videos. 

    July 24, 2014 1 Photo

Obituaries
Record
Facebook
AP National