Why It’s HARD To Land on Mars

This video is about why it’s harder to successfully land spacecraft and landers and rovers on Mars than on Earth, or Venus, or the Moon, or Titan, or asteroids. It all comes down to atmospheric density! When there’s no atmosphere, you can do a powered descent in a flimsy tinfoil spacecraft like the Lunar Module, and when there’s plenty of atmosphere you can do an unpowered descent via heat shield and parachutes like the space shuttle, Apollo command module, Soyuz, Huygens, etc. But on Mars with its thin air, you have to do both powered & unpowered descent, getting the worst of both worlds.

7 Astounding Facts About The Great Wall Of China

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The Great Wall of China is undoubtedly one of the great wonders of this world. Here some interesting facts about it.

1. It is really really really really long, longer than you think… If you added the length of all the defensive walls created in China over the last 2,000 years, and lined them end to end, then the total length (apx. 31,070 miles) would reach 1.25 times around the Earth (apx. circumference 24,854 miles).

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How to Sleep on a Plane

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Sleeping on an airplane often requires more effort than it does relaxation, but it is absolutely worth it. Late night flights are called “red eyes” for a reason and no matter how energetic or fit you may be, muscling through your day on minimal sleep is never a good idea. That said, late night flights are also an extremely practical way to get more bang for your vacation buck. The key is to have a system for getting some shuteye between runways. Here’s a few tips that can make nodding off considerably easier.

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