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Astronauts often forget about gravity when they return to Earth

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Astronauts often forget about gravity when they return to Earth 😬

Astronauts often forget about gravity when they return to Earth 😬

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Zero gravity on Earth works differently vs zero gravity in space. Plus the NASA Astronauts always need to look their best, so they use a lot more hairspray on the ISS. Obviously.

Zero gravity on Earth works differently vs zero gravity in space. Plus the NASA Astronauts always need to look their best, so they use a lot more hairspray on the ISS. Obviously.

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When exactly does it adjust for earth curvature? Wait…..gravity….

When exactly does it adjust for earth curvature? Wait…..gravity….

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🚨 “UNKNOWN OBJECT” STRIKES SPACECRAFT - THREE ASTRONAUTS NOW TRAPPED ABOVE EARTH They’ve been aboard the Tiangong station since April running experiments, walking in space, and preparing to return home. Then their Shenzhou-20 return capsule was struck by an unknown object. Now they’re drifting in zero gravity, oxygen ticking down, and Beijing’s gone silent. If it wasn’t debris… what else is circling above us?

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This is the path Artemis II will take – sending humans out again next March, after more than 50 years. Instead of a straight shot, NASA is sending four astronauts on a "hybrid free-return trajectory." They'll whip around Earth to gain speed, then use the Moon's gravity like a giant slingshot to hurl themselves back home. No engine burns for the return trip, just pure orbital mechanics and vibes.

This is the path Artemis II will take – sending humans out again next March, after more than 50 years. Instead of a straight shot, NASA is sending four astronauts on a "hybrid free-return trajectory." They'll whip around Earth to gain speed, then use the Moon's gravity like a giant slingshot to hurl themselves back home. No engine burns for the return trip, just pure orbital mechanics and vibes.

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If there were 4 astronauts on the Artemis II mission, who was filming? Did the camera make that movement, ending in a close-up on Earth, because of zero gravity?🤔

If there were 4 astronauts on the Artemis II mission, who was filming? Did the camera make that movement, ending in a close-up on Earth, because of zero gravity?🤔

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The Citi Field scoreboard showed the Artemis II astronauts returning safely to Earth tonight! 👏

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Hairspray on The International Space Station at zero gravity works differently to hairspray at zero gravity on Earth. Figured out why yet?

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When a spacecraft leaves Earth, it doesn’t just fire its engines and head straight to its destination. In many missions, especially those going beyond low Earth orbit, there’s a more subtle and elegant strategy at play, one that uses gravity itself as part of the navigation system. This is often called a gravity assist, or a slingshot maneuver. But in the case of missions like #Artemis II, what’s being used is a closely related idea known as a free-return trajectory. At first glance, it might sound simple: the spacecraft goes to the Moon, loops around it, and comes back. But the physics behind it is anything but simple. Instead of relying on continuous propulsion, the spacecraft follows a carefully calculated path through the gravitational field of the Earth–Moon system. It is launched with just the right speed and direction so that, as it approaches the Moon, the Moon’s gravity bends its trajectory. The spacecraft is effectively flung around the Moon, redirected onto a path that naturally brings it back toward Earth. No major engine burn is needed for the return. Small trajectory corrections may still be required, but gravity does the heavy lifting. That’s the key. This kind of trajectory is not just efficient, it’s also safe. If something goes wrong with the spacecraft’s engines or onboard systems, gravity itself ensures the return. It’s an inherent backup plan, built into the trajectory from the very beginning. The same fundamental idea appears in gravity assists used across the Solar System. When a spacecraft flies past a planet, it can gain or lose speed by exchanging momentum with that planet. From the spacecraft’s point of view, it’s as if it has been accelerated without using fuel. In reality, it has borrowed a tiny amount of orbital energy from the planet itself. That’s how missions like Voyager reached the outer planets, and how probes continue to explore regions far beyond what their onboard fuel alone would allow. But there’s an important distinction. An interplanetary gravity assist is typically used to change speed and direction, often increasing the spacecraft’s energy. A free-return trajectory, like the one used in Artemis II, is designed for something more specific: a path that naturally loops back to Earth without requiring additional propulsion. It’s less about gaining energy, and more about shaping a trajectory that guarantees a return. To understand why this works, it helps to stop thinking in straight lines. In space, motion follows curves defined by gravity. The spacecraft is constantly falling, first toward Earth, then toward the Moon, and then back toward Earth again. What looks like a loop is really a continuous free fall through a changing gravitational landscape. This way of navigating space reveals something deeper. We tend to think of engines as the drivers of motion, but once a spacecraft is on its way, gravity does most of the work. The art of spaceflight is not just about thrust. It’s about knowing when not to use it. #GoodLuck #Artemis NASA Artemis

When a spacecraft leaves Earth, it doesn’t just fire its engines and head straight to its destination. In many missions, especially those going beyond low Earth orbit, there’s a more subtle and elegant strategy at play, one that uses gravity itself as part of the navigation system. This is often called a gravity assist, or a slingshot maneuver. But in the case of missions like #Artemis II, what’s being used is a closely related idea known as a free-return trajectory. At first glance, it might sound simple: the spacecraft goes to the Moon, loops around it, and comes back. But the physics behind it is anything but simple. Instead of relying on continuous propulsion, the spacecraft follows a carefully calculated path through the gravitational field of the Earth–Moon system. It is launched with just the right speed and direction so that, as it approaches the Moon, the Moon’s gravity bends its trajectory. The spacecraft is effectively flung around the Moon, redirected onto a path that naturally brings it back toward Earth. No major engine burn is needed for the return. Small trajectory corrections may still be required, but gravity does the heavy lifting. That’s the key. This kind of trajectory is not just efficient, it’s also safe. If something goes wrong with the spacecraft’s engines or onboard systems, gravity itself ensures the return. It’s an inherent backup plan, built into the trajectory from the very beginning. The same fundamental idea appears in gravity assists used across the Solar System. When a spacecraft flies past a planet, it can gain or lose speed by exchanging momentum with that planet. From the spacecraft’s point of view, it’s as if it has been accelerated without using fuel. In reality, it has borrowed a tiny amount of orbital energy from the planet itself. That’s how missions like Voyager reached the outer planets, and how probes continue to explore regions far beyond what their onboard fuel alone would allow. But there’s an important distinction. An interplanetary gravity assist is typically used to change speed and direction, often increasing the spacecraft’s energy. A free-return trajectory, like the one used in Artemis II, is designed for something more specific: a path that naturally loops back to Earth without requiring additional propulsion. It’s less about gaining energy, and more about shaping a trajectory that guarantees a return. To understand why this works, it helps to stop thinking in straight lines. In space, motion follows curves defined by gravity. The spacecraft is constantly falling, first toward Earth, then toward the Moon, and then back toward Earth again. What looks like a loop is really a continuous free fall through a changing gravitational landscape. This way of navigating space reveals something deeper. We tend to think of engines as the drivers of motion, but once a spacecraft is on its way, gravity does most of the work. The art of spaceflight is not just about thrust. It’s about knowing when not to use it. #GoodLuck #Artemis NASA Artemis

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"There are people who want to return to the days of Napoleon" "But they forget how it ended" Vladimir Putin

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Gravity causes planets to orbit around their stars and bodies on Earth to fall towards the ground; however, goats seem they don't care at all [📹 Sebastian Boxleitner / boxigraphy_bnw]

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