The Commercial-News, Danville, IL

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
  • The Simpsons still going strong

    The groundbreaking animation first hit the air Dec. 17, 1989, but the family first appeared on television in "The Tracey Ullman Show" short "Good Night" on April 19, 1987.

    August 21, 2014

  • Police chief resigns over racial slur repost to Facebook

    A repost on his personal Facebook page of a racially-charged comment by the original poster of a comedy video has forced the police chief of an Oklahoma city to resign his office.

    August 21, 2014

  • Does Twitter need a censor?

    Twitter decided last year to make images more prominent on its site. Now, the social network is finding itself caught between being an open forum and patrolling for inappropriate content.

    August 21, 2014

  • sleepchart.jpg America’s sleep-deprived cities

    Americans might run on sleep, but those living in the country's largest cities don't appear to run on much.

    August 20, 2014 1 Photo

  • Who should pay for your kids ACT?

    Thirteen states paid for 11th-grade students in all public high schools to take the ACT college admission test this year, with several more planning to join them in 2015.

    August 20, 2014

  • Pets.jpg Why do people look like their pets?

    As much as we might quibble over the virtues and vices of Canis domesticus, however, and over whether human nature is any better or worse than dog nature, even dog fanciers don't usually want to look like a dog.

    August 20, 2014 1 Photo

  • Ice bucket challenge trending up

    Internet trends are a dime a dozen these days. Everything from Tebowing to planking to the cinnamon challenge can cause a wave of social media activity that can last for weeks before fizzling out.

    August 19, 2014

  • Africa goes medieval in its fight against Ebola

    As the Ebola epidemic claims new victims at an ever-increasing rate, African governments in Sierra Leone, Guinea and Liberia have instituted a "cordon sanitaire," deploying troops to forcibly isolate the inhabitants in an area containing most of the cases.

    August 18, 2014

  • Democrat? Republican? There's an app for that

    If you're a Republican, you might want to think twice before buying Lipton Iced Tea, and forget about Starbucks coffee. If you're a Democrat, put down that Reese's Peanut Butter Cup, and throw away the cylinder of Quaker Oats in your pantry.

    August 18, 2014

  • Five myths about presidential vacations

    In the nuclear age, presidents may have only minutes to make a decision that could affect the entire world. They don't so much leave the White House as they take a miniature version of it with them wherever they go.

    August 15, 2014

E-edition
AP Video
Furry Roommates: Dorms Allowing Cats and Dogs Chase Rice Defends Bro-Country 'Jersey Shore Massacre' Pokes Fun at MTV Series Raw: Wash. Mudslides Close Roads, Trap Motorists DC's Godfather of Go-Go Honored Ukraine Calls Russian Convoy a 'direct Invasion' Girl Meets Her 'one in the World' Match Coal Gas Boom in China Holds Climate Risks Japan Landslide Rescuers Struggle in Heavy Rain Raw: Severe Floods, Fire Wrecks Indiana Homes Endangered Red Wolves Face Uncertain Future Raw: Russian Aid Convoy Arrives in Ukraine Okla. Policeman Accused of Sex Assaults on Duty Dominican Republic Bans Miley Cyrus Concert Raw: Israeli Air Strike in Gaza Raw: Bodies of MH17 Victims Arrive in Malaysia Attorney: Utah Eatery Had Other Chemical Burn
NDN Video
School serves diabetic girl trashcan pizza Battle of the Butts at the 2014 MTV VMAs! Four-Year-Old Reviews Exclusive Restaurant's $295 Fixed Price Menu Mariah Orders Nick Cannon to Stay Quiet About Divorce Details U.S. Military Strategy Against ISIS The London Zoo holds its annual animal weigh-in VIDEO: Goliath Grouper eats shark in one bite Rapper Almost Walks Off CNN Over Ferguson Coverage 2 American Ebola Patients Released From Hospital Whoa! Jimmy Fallon Shaves Jared Leto's Beard US Mission to Rescue Hostages in Syria Failed Reggie Jackson's ALS Ice Bucket Challenge Amazing Encounter With Sea Otter Caught on Video Motorcyclist Sticks Landing Sicilian hilltop homes on sale for one euro Are Mariah Carey and Nick Cannon Breaking Up? Joel McHale Interviews Chelsea This 'Breaking Bad' Reunion is the Most Hilarious Thing You'll See All Day! President Obama talks about who James Foley was Nicki Minaj Unleashes Her 'Anaconda' On the World
Must Read