
Yuri
15.1K posts






We're not going to travel beyond the solar system, according to Leonard Susskind. And neither are aliens, coming to visit us. We may not be alone, but we are stuck here for, essentially forever. 1. The nearest star is 4.24 light years away. The fastest spacecraft ever built would require 6,600 years to get there. 2. Surely we can just build faster spacecraft. The problem is to get to anywhere close to the speed of light, we need exponentially more energy. 3. Chemical rockets will just not work. Even fusion rockets won't work. Even 10% of the speed of light is not achievable. The Tsiolkovsky Rocket Equation prevents it. 4. Interstellar dust becomes hand grenades when traveling anywhere close to the speed of light. Ships break. 5. Space radiation will kill us over the time need to travel interstellar distances. Impossible to protect without massive shields, which require massive energy to accelerate and de-accelerate.



Impresionante time-lapse de la maniobra de inyección trans-lunar de Artemis II, que ha puesto oficialmente a la expedición rumbo a la Luna





@fluffypony multi-mempalace


Have you ever seen honey in space? This might be the coolest video we've seen all week. Nothing will ever be the same.


Random thought cause I'm not a scientist but why couldn't they have sent a satellite that orbits higher above the moon that's not blocked by the moon and still has contact with Earth so they wouldn't lose signal when they're behind the moon? 🤔


TOILET UPDATE: Orion's toilet is NO-GO for use. Houston has requested all Artemis II crew members to use their Collapsible Contingency Urinals (CCUs) in the meantime.

📸| David Raya and Kepa in training this morning! 🧤#UCL



They thought reuse was crazy because they assumed the market for launches was inelastic, so the money spent on reuse wouldn't save costs long term because keeping the factory open and the line running wouldn't get any cheaper.








