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danR replied to the thread Einstein wins again! Quarks obey relativity laws, Large Hadron Collider finds.The decay emits the electron, not the quark. Conservation laws require the mass/energy, charge, and whatnot be preserved in Nature's... -
danR reacted to George²'s post in the thread Boom Supersonic to break sound barrier during historic test flight today: Watch live with
Like.
Done, speed max go to mach 1.11. -
danR replied to the thread Boom Supersonic to break sound barrier during historic test flight today: Watch live.Watching live. Currently big fat watermark in the middle, no ambient on-ground audio (only comms chatter), dumb background musak. Some...
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danR replied to the thread What are boson stars — and what do they have to do with dark matter?.If they have no mass, they have no momentum.
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danR replied to the thread Electric spacecraft propulsion may soon take a leap, thanks to new supercomputer." The plume of ions jetting out from the spacecraft therefore acts to provide thrust." Not quite. Once they are expelled, as with a...
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danR replied to the thread NASA will announce update to Mars sample return plans on Jan. 7. Here's how to listen in."NASA would likely not be able to return Perseverance's samples to Earth until 2040, a full 20 years after the rover first launched to...
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danR replied to the thread Can NASA's troubled Mars Sample Return mission be saved?.2018, a Falcon Heavy yeeted an automobile+final-stage mass towards Mars' orbit. Since an unmanned Starship that does not need to...
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danR replied to the thread Can NASA's troubled Mars Sample Return mission be saved?.Sounds like you do not disagree with a <2040 date, then, which satisfies the constraints indicated in the article. As for ~2029, SpaceX...
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danR reacted to Nik0101's post in the thread Can NASA's troubled Mars Sample Return mission be saved? with Like.
Ah, yes. And I'm sure he'll begin building his Mars base with AI powered, self-replicating, Go-Go dancing robots at the same time. The...
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danR replied to the thread Can NASA's troubled Mars Sample Return mission be saved?.Not only can SpaceX do it for less, the whole project is being rendered moot by the company's own boots-on-the-ground timeline. They...
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danR reacted to monkeyonmars's post in the thread Can NASA's troubled Mars Sample Return mission be saved? with Like.
I think Musk can do it for less than $11 billion. Just got to get that fuel transfer working.
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danR replied to the thread Black holes can squash star formation, James Webb Space Telescope finds."Squash" "Quash", with its sense of "suppress", might be better employed here; and is closer to the paper's frequent use of the word...
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danR replied to the thread Hubble trouble or Superbubble? Astronomers need to escape the 'supervoid' to solve cosmology crisis.The article is interesting but seems rather repetitious. I feel it would be more lucidly presented in four or five paragraphs.
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danR reacted to Don M's post in the thread Hubble trouble or Superbubble? Astronomers need to escape the 'supervoid' to solve cosmology crisis with Like.
The Universe's "incredibly rapid rate" of expansion depends on perspective. The current rate is ~7% larger every billion years.
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danR replied to the thread Why we can't just name a quasi-moon 'Moony McMoonface.Because they just plain won't listen to you. I thought a certain Mars Rover in a naming contest should be called Dusty McDustface. But...
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