ChrisA's latest activity
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CChrisA replied to the thread Design an interstellar 'generation ship' to spend decades among the stars with Project Hyperion competition.crossing the gaps between stars certainly is physically possible. But not by sending modern-day humans. In only a few decades we...
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CChrisA replied to the thread Why does classical physics gravity formulas/measurements do not work at a quantum level, what’s missing?.My opinion is that classical physics is just a shortcut. It is the result of summing trillions of quantum effects. Other examples of...
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CChrisA replied to the thread Design an interstellar 'generation ship' to spend decades among the stars with Project Hyperion competition.One huge problem. Almost every first-world country now has a birth rate less than 2.1. This means their population is shrinking...
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CChrisA replied to the thread World's 1st wooden satellite arrives at ISS for key orbital test.I don't think this is the fist use of wood in space. In the 1970s and 1980s there were Chinese satellites that use an oak heat shield...
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CChrisA replied to the thread The absurdity of space-time curvature and geodesics.General relatively is a field theory, It is like Maxwell's equations. Both are field theories. I guess you would argue that a...
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CChrisA replied to the thread Watch SpaceX Crew-9 astronauts move Crew Dragon spacecraft to new ISS parking spot on Nov. 3.They ALWAYS put all the astronauts onboard when they move the capsules. The reason is if the docking fails and they can't reconnect to...
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CChrisA replied to the thread SpaceX Crew-8 astronaut released from hospital, returns to Houston.My hope is that the astronaut in question simply tells us what went on. But if he fails to do that, we the people who paid for ISS...
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CChrisA replied to the thread Europe's bold 'Explore 2040' campaign aims to get astronauts to the moon and Mars.This is clearly not a 21st-century project. And if it is ever needed depends on if there is ever a need to launch thousands of tons of...
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CChrisA replied to the thread Negative Mass exists, Newton's Laws opposite.You see a flat disk that is not perpendicular to our line of sight. The disk would appear to have an elliptical or "arched" shape...
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CChrisA replied to the thread Spooky fireball blazes across Lake Erie a week before Halloween (video).So what can we know about the size and composition of this object from its brightness and color?
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CChrisA replied to the thread Blowing up: Inflatable space habitats could be key to exploring the solar system.I think the gas can be recycled. Air is mostly nitrogen (78%, I think). So they use liquidifed air to remove the dust and then...
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CChrisA replied to the thread Blowing up: Inflatable space habitats could be key to exploring the solar system.Clearly, they do not need to be flexible. But if they are, then more "stuff" can be launched in one rocket, The volume of payload...
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CChrisA replied to the thread NASA at a crossroads:' Budget woes, aging infrastructure and hard choices ahead.NASA is building payloads to put on top os SpaceX rockets. The payloads are the hard and expensive part. For example, an...
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CChrisA replied to the thread Mars Habitat Construction: Grow the materials needed on Mars!.If you are looking to reduce the cost you first have to have a very good cost model that adds up the cost of all the parts you need...
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CChrisA replied to the thread SETI tests new alien-hunting strategy, but TRAPPIST-1 planets remain silent.We are actually learning quite a lot from SETI. We now know there is no galactic Internet-like radio network. We know that no one is...
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