billslugg's latest activity
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billslugg replied to the thread sinks vs gravity vs source.Yes, things orbit endlessly unless some kinetic energy can be converted to heat. Best way to do this is through collisions. It need not... -
billslugg replied to the thread What's behind the Martian methane mystery?.Mars has a lot of seasonal variation in the southern hemisphere. The orbit is elliptical and those in the south have their winter when...
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billslugg replied to the thread How SpaceX's historic Polaris Dawn private spacewalk will work.The illustration appears to be an artist's concept. Retrograde is very expensive because you don't get the Earth's speed, it works...
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billslugg reacted to ChrisA's post in the thread SpaceX's Starship will go interstellar someday, Elon Musk says with
Like.
I don't think even Elon Musk thinks humans will be traveling to other star systems. We don't live long enough to survive even 10% of... -
billslugg replied to the thread The Discovery of Photon Mass Supports the Theory of Photons Having a Gravitational Effect.If photons lose energy as they travel, where does that lost energy go?
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billslugg replied to the thread How can we protect humans on Mars from radiation from solar storms?.The lighter the nuclei, the more it recoils when hit by a massive particle. This is how energy is removed from the big particle...
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billslugg replied to the thread How AI is helping us search the universe for alien technosignatures.We know some of the higher animals are speaking in a complex language. The cetacean's noises are not random, have purpose, convey...
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billslugg reacted to Gibsense's post in the thread The Case for the Schwarzschild Radius Always Actually Being Zero with Like.
Yes, the spacetime geometry curves. Space and Time (time at 90 degrees) rotate with the curvature. Light is affected by gravitation...
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billslugg replied to the thread How can we protect humans on Mars from radiation from solar storms?.Solar storms are only part of the problem. Galactic cosmic rays are far more powerful and are not stopped by heavy nuclei very well...
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billslugg reacted to dimap's post in the thread Introduce yourself! (And show us your swag) with Like.
Hello World! You can call me Dmitri, though I was called differently at different places.. I was born in the middle of Soviet Union and...
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billslugg reacted to COLGeek's post in the thread Question Why We Haven’t Met Any Aliens Yet? with Like.
Closing this now. There is no verifiable evidence of alien visitors. Not a matter of insanity to believe something is possible. As a...
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billslugg replied to the thread Move in Space without mass exchange.The assembly will not rotate about the motor axis, but around the assembly's center of mass.
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billslugg reacted to Helio's post in the thread NASA spacecraft captures 1st photo of its giant solar sail while tumbling in space with Like.
And don't forget light sail propulsion comes with a 2 for 1 special. :) The momentum of the photon pushes the sail when it impacts it...
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billslugg reacted to AboveAndBeyond's post in the thread SETI searches for alien life in over 1,000 galaxies using unexplored radio frequencies with Like.
The frequency is one thing but no mention was made of the bandwidth resolution they had. Artificial signals are likely to have their...
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billslugg replied to the thread Introduce yourself! (And show us your swag).Welcome to the forum! EM waves have a rest mass of zero, but they are never at rest. All photons move all the time, all photons have...
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