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🧵THE OBJECT ORBITING EARTH THAT ASTRONOMERS WONT CALL NATURAL (1/6) A small object called Sar2901 recently passed Earth and entered a temporary orbit around the Earth-Moon system and people are going wild. When the Minor Planet Center looked at the observations, it couldn't decide whether Sar2901 was a natural...

51,508 Aufrufe • vor 3 Tagen •via X (Twitter)

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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

Erika 

235,073 Aufrufe • vor 5 Monaten

The discourse around the Eze penalty last night is fascinating. If nothing else it provides Arteta with an excuse as to how his team has been hard done by and robbed. He loves excuses. It’s a fascinating situation because I actually think the right outcome was reached albeit through the wrong process. Once given on the field under the current rules it shouldn't have been overturned. For that Arsenal can feel aggrieved. Don't forget Arsenal were the beneficiaries of an incredibly soft penalty in Leverkusen. It wasn’t overturned. I find the attached video interesting because it clearly shows how minimal the contact is. The defender doesn’t pin Ezes foot to the ground. Doesn’t smash into it. It brushes down the side of it. It’s where the still pictures of it were wildly misleading. Are we really saying that contact such as that is worthy of a penalty? What’s clear in the video is that Eze has absolutely made the most of the slight contact. I love the straight left leg. A very natural position. It’s a brilliant dive and normally it would have been rewarded. By saying that is a stone wall penalty all we are doing is encouraging such theatrics and cheating. Whenever you hear the words “that was clever” by a commentator they are intimating the player has cheated/made the most of it. We complain about refs all the time but what chance do they have when players are doing stuff like this. Until players are punished properly there is no disincentive for players to keep doing this stuff. I also find it fascinating when you have a foot brushed like this. When you compare it to all the holding/pushing/grappling at other times. Sometimes a contact sport and others not. Is this really what football has become?

Luke Paton

104,573 Aufrufe • vor 4 Monaten

I want to believe, but there's too much evidence that not only tells me but shows me that they lied. I feel like low Earth orbit is as far as we can go... 1. The van Allen radiation belt. 2. The disgusted, unexciting, ashamed post moon landing conference with the three astronauts. Their body language, mannerisms, and answers scream that they're lying. 3. The lack of noise of the jet engines in the "videos." 4. How did they get the lunar rover on the spaceship? 5. No craters or dust underneath the spaceship. 6. How did the film the spaceship take off perfectly if nobody was left on the moon to operate the camera, and how was it so perfect if there was a delay? 7. The rockets and the spaceship look like a model. 8. The video of them saying that they are 130,000 miles away from Earth when all they really did was cover up the windows when they are in low earth orbit and film a small portion of Earth from low Earth orbit to simulate that they were far away, but then you find out that they're only in low Earth orbit when they uncover the windows. (Shown in the video below) 9. How we have to redesign the space suits to be able to handle the atmosphere on the moon. 10. The lack of talk and missions to the moon ever since. 11. The numerous blacked out photos from NASA. 12. How an older smartphone has way more technology than the entire spaceship back in 1969, and how we were able to even communicate with them in the spaceship as the one astronaut who passed away before the moon launch specified that they had trouble communicating between buildings and the shuttle on the ground. 13. Not one single astronaut would put their hand on the Bible and say they went to the moon. Why? 14. All the CGI and bubbles caught on NASA videos. 15. All the green screen captures and astronauts on wires in the "shuttle" and on the "ISS." There are so many bloopers and outtakes of astronauts and shuttle hatches malfunctioning, people appearing in the background of videos of the shuttle, people fading in and out, I could go on forever... How would you convince me against the evidence or prove me wrong from the arguments that I have provided?

The SCIF

32,347 Aufrufe • vor 1 Jahr