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dgavin
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dgavin
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2019-Feb-15,
05:46 PM
grapes
replied to a thread
Thanks to the posters on this forum for helping me write four books
in
Space/Astronomy Questions and Answers
Unwittingly? Duh :)
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2 replies | 224 view(s)
2019-Feb-13,
04:47 PM
grapes
replied to a thread
zero dimensional point particle
in
Space/Astronomy Questions and Answers
Electrons are often considered just points (and/or waves) as far as size, but electron spin is a non-point characteristic, no?
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16 replies | 528 view(s)
2019-Feb-10,
07:31 PM
grapes
replied to a thread
Would it be possible to jetpack back to Earth from the Moon?
in
Space/Astronomy Questions and Answers
But we're talking about teen try Whatever (humongous) energy you need to get out of the earth well is returned to the astronaut at teen try, the...
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31 replies | 992 view(s)
2019-Feb-10,
06:29 PM
grapes
replied to a thread
Solar shield idea to address climate change.
in
Science and Technology
Or, the 6 looks like a b. A fine line, I guess. 50km in radius is pretty big! Not sure what current technology would handle that. Let's see,...
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34 replies | 938 view(s)
2019-Feb-10,
05:44 PM
grapes
replied to a thread
Mercury as Winter Evening Star
in
Astronomy
Thanks Curt! will watch for it I've seen it from suburban shopping center parking lots, and people still insist it is difficult :)
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1 replies | 159 view(s)
2019-Feb-06,
09:14 PM
grapes
replied to a thread
The Football Planet
in
Astronomy
I wasn't sure what you were considering the "center" for the centrifugal velocity. If you follow each point of the planet, it describes a circle...
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29 replies | 950 view(s)
2019-Feb-06,
05:35 PM
dgavin
replied to a thread
Krakatoa has erupted, looks like a VEI-6 (Larger the St Helens a little)
in
Geology & Planetary Surfaces
I know. A lot of data was not gathered. This was probably the first Caldera Collapse type eruption in our life times, and that data could of been...
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22 replies | 1147 view(s)
2019-Feb-04,
03:26 PM
dgavin
replied to a thread
Krakatoa has erupted, looks like a VEI-6 (Larger the St Helens a little)
in
Geology & Planetary Surfaces
While my VEI estimate was incorrect, I did get the caldera collapse part right. Found a good before/after image.
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22 replies | 1147 view(s)
2019-Feb-01,
04:02 PM
grapes
replied to a thread
The Football Planet
in
Astronomy
Centrifugal velocity? Is the center the center of the star? Centrifugal velocity would be smallest at the "far" end of the planet, no?
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29 replies | 950 view(s)
2019-Jan-24,
02:31 PM
grapes
replied to a thread
What do you think is mainstream in cosmology?
in
Astronomy
Be careful of absolute statements about physics, especially when you a self-described non-expert are disagreeing with physics interpretations. ...
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55 replies | 1536 view(s)
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