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Apr
8
revised Path of a proton in a magnetic field
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Apr
8
answered Path of a proton in a magnetic field
Apr
8
answered Is there any difference between fusing and smashing particles?
Apr
5
comment Why is the sky of the moon always dark?
Indeed! I meant 7% / 0.07, not both.
Mar
31
revised Are nuclear processes the only processes that release more energy than is input?
added 315 characters in body
Mar
31
answered Are nuclear processes the only processes that release more energy than is input?
Mar
29
comment Why is the sky of the moon always dark?
However, where landings happen the duller dust is stirred up and moved; and the angle of incidence to the camera is not perpendicular to the surface. Check out this page with a reproduction on earth with a soup can: www3.telus.net/summa/moonshot/fillit.htm
Mar
29
comment Why is the sky of the moon always dark?
I can't find many good measurements of lunar surface albedo near landing sites, but it does have an overall average of 0.07% to 0.11% (0.12% including earthshine), comparable to worn asphalt on earth. This would put it quite low compared to snow and deserts, see this chart on the Albedo wiki page.
Mar
28
comment Why is the sky of the moon always dark?
Rovers have, and they have cameras.
Mar
28
answered Why is the sky of the moon always dark?
Mar
19
awarded  Notable Question
Mar
3
answered Is the difference between an event horizon and a singularity merely perspective?
Jan
26
answered Is it possible for the universe to be moving towards something, rather than expanding?
Jan
22
awarded  Popular Question
Jan
20
comment Would cosmological redshift be present in the following situation?
What's a better way? I was hoping to pin it down to this (preposterous) example to nail down specifically what I'm having a hard time understanding; which is the two planets are fully stationary with respect to each other.
Jan
20
comment Would cosmological redshift be present in the following situation?
If it's viewed that way, then the cable stays perfectly taut and doesn't flex during said 'movement'? I'm not sure I'd consider that movement.
Jan
20
comment Would cosmological redshift be present in the following situation?
That last part confused me more. Which is it? If it is actually a property of expansion of space, then why wouldn't the situation pictured above experience redshifted planetary light?
Jan
20
comment Would cosmological redshift be present in the following situation?
Ah - so if we knew true velocities, the entire redshift would be simply due to relativistic doppler effects using said true velocity? I think that answers my question.
Jan
20
comment Would cosmological redshift be present in the following situation?
Why is it initially blueshifted?
Jan
20
comment Would cosmological redshift be present in the following situation?
I guess the fundamental part I'm asking is whether or not the cosmological redshift happens as the light travels through expanding space, or just due to observer velocities, peculiar or proper.