851 reputation
517
bio website orthogonaltonormal.com
location Johnstown, PA
age 32
visits member for 2 years, 7 months
seen 20 hours ago
//TODO Glorious Lies

2d
comment How did they take photos of Jupiter?
I'd add that most amateur images of the planets are made using a video camera and the combining the handful of best frames (from when the air was exceptionally steady) from several minutes of recording (longer than that and motion blur becomes a problem due to rotation).
2d
comment How did they take photos of Jupiter?
@kasperd The separation between Jupiter's moons and the shadows they cast on the planet can be much larger than in the OPs picture. ex in this amateur picture the shadows are on the left edge of the planet while the moons are to the its right. Both moons are in the segment of their orbits that is mostly between earth and Jupiter but slightly to the right. (IO orbits at ~ 5 R_j; the other major moons are several times farther out.)
Jul
21
comment Neutrino annihilation and bosons
Were you thinking of neutrino absorption? I've seen estimates that layer of matter just outside the core in a supernova collapse is dense enough to absorb ~10% of the neutrino flux produced within the core itself; but don't recall seeing anything about neutrino annihilation before.
Jun
6
comment Why does a ball bounce lower?
Is the sound made when the ball bounces also carrying away frictional energy from the deformation?
May
23
comment How intense a magnetic field would it take to keep an hypothetical iron-made moon orbiting around it?
@Joshua I think you're remembering that there're no stable orbits with 4+ spacial dimensions; off hand I'm not sure if that would be a problem for a magnetic orbit or not. askamathematician.com/2012/05/… (~3-4 screens down)
May
21
comment Photobombing without app used by Harley Davidson
Looking at what the company you got your graph from sells (conversion of cameras to IR/UV use by replacing stock filters), I believe the graph you're using shows the sensors response without the standard IR/UV rejection filter, not the response of an off the shelf version.
May
21
comment Photobombing without app used by Harley Davidson
@ChrisWhite same here. That the IR filter in SLRs heavily attenuates the 656nm H-Alpha emission line is commonly cited as a reason why dedicated astrophotographic cameras are preferable for imaging nebula's.
May
19
comment What would we see in the sky if it weren't blue
@Nathaniel Do you have a citation for some stars being visible during daylight? Based on the personal difficulty of spotting Venus during the day and an informal survey done my one of the astronomy mags a few years back that put spotting Mercury in daylight at the threshold of human ability in near perfect conditions I'm skeptical about more than a few stars being visible.
May
2
comment Need explanation for a sketch of various spacetime dimensions
@Kartik it's tachyons (see a larger version on Wikipedia for legibility); they're a group of theoretical particles that in our 3+1 spacetime are what you get when you plug speeds greater than c into relativity. I don't know what the significance of the 1+3 location being marked tachyons only is.
Mar
20
comment Why can't you hear music well over a telephone line?
@ThePhoton I think you're assuming too much about the interviewer. Hinting at one part of it that they think would be easy for the interviewee to figure out even if they don't know much about how POTS works doesn't mean they'd reject a more in depth answer that requires greater historical knowledge of how the system was originally designed.
Dec
19
awarded  Yearling
Dec
16
comment How to measure resistance of a piece of wire?
Instead of using a long coil of wire, would using one with a relatively high resistance like nichrome (used in heating elements) work as well?
Oct
4
comment How would charge be distributed in charged conductors if the Coulomb law was not ${1}/{r^2}$?
@RedGrittyBrick as described in that link fictional physics is off topic if inadequately defined to the point that an answer cannot be given. Richard's question doesn't have that problem; and legitimate science has been done on what would happen if the rules or constants defining any of the fundamental forces were different.
Sep
26
comment How big should a lens of a telescope be so we can see the American flag on the Moon from the Earth's surface?
Interferometry can get equivalent resolution to a single huge telescope with several smaller ones spaced as far apart as the single huge one. But if I understand correctly, what is done is to take an image of the interference pattern and use a computer to figure out what input would create the pattern; it doesn't give an image directly.
Sep
26
comment How big should a lens of a telescope be so we can see the American flag on the Moon from the Earth's surface?
We wouldn't only need a huge telescope; to compensate for the Earths atmosphere we'd need adaptive optics that are equally beyond anything that's been built so far.
Sep
26
comment Can Helium Disappear from Earth?
@Wouter for nuclear synthesis we'd be better off irradiating something in a fission reactor that created a short lived isotope that emitted alpha particles (helium nuclei) and captured it that way. However I'd be shocked if that resulted in a price low enough for non-industrial use. Tritium and radionuclides used in cancer treatment are produced that way but cost thousands of dollars/gram.
Sep
13
comment Weak force: attractive or repulsive?
@Trimok because opposite weak charges attract. If you're asking why the weak force is that type of force instead of a different one, you're going beyond what is currently known. It's possible that a unified theory (ex string theory) might be able to answer that question at some point in the future. It's also possible that such a theory will end up trading one set of magic-numbers-to-make-it-work for another set (for string theory the shape of the extra dimensions of space).
Sep
9
comment Explaining UV radiation to a 6 year old
@Cleonis working with a 6yo you could even use that the kid will be able to hear high frequencies you can't any more.
Aug
22
comment Accidental, unplanned breakthroughs in physics
Is listing CdTe twice in "CdTe/HgTe/CdTe" a typo?
Aug
19
comment How long until we fall into the Sun?
@JackAidley The sun will turn into a red giant in ~5bn years. The most detailed model of what will happen then created so far has the Earth being tidally dragged into the sun just before the end of the red giant phase. However since the Earth is right on the cusp of being destroyed/surviving the result shouldn't be considered definitive.