Reputation
1,578
Top tag
Next privilege 2,000 Rep.
Access moderator tools
Badges
3 17
Newest
 Nice Answer
Impact
~15k people reached

Nov
5
revised Is there a natural process by which hydrogen is generated from heavier elements in the cosmos?
New insight on matter creation
Nov
1
comment Is there a natural process by which hydrogen is generated from heavier elements in the cosmos?
Motion is relative. Maybe there'll be other protons / hydrogen atoms moving in the same direction with the same speed... I think the entropy argument from the other answer is best. The universe is just simply going to shreds -- very slowly...
Oct
30
comment Is there a natural process by which hydrogen is generated from heavier elements in the cosmos?
Wikipedia says about protons in nuclear decay: »Shortly after the discovery of the neutron in 1932, Enrico Fermi realized that certain rare beta-decay reactions immediately yield neutrons as a decay particle (neutron emission). Isolated proton emission was eventually observed in some elements.«
Oct
30
revised Is there a natural process by which hydrogen is generated from heavier elements in the cosmos?
deleted 11 characters in body
Oct
30
answered Is there a natural process by which hydrogen is generated from heavier elements in the cosmos?
Oct
29
comment Why do black holes have jets and accretion disks?
I have very little understanding of black holes, but maybe the accretion disk is another effect produced by the conservation of angular momentum? Just like Protoplanetary disks, galaxies and so on.
Oct
21
awarded  Nice Answer
Oct
18
revised Why does Titan's atmosphere not start to burn?
corrected spelling, better title
Oct
18
awarded  Custodian
Oct
18
reviewed Leave Open What is in the center of the universe?
Oct
18
reviewed Close Is the moon rotation at complete standstill?
Oct
18
answered Why does Titan's atmosphere not start to burn?
Oct
18
suggested approved edit on Why does Titan's atmosphere not start to burn?
Oct
17
answered Does the Reflection Method for Looking at the Sun Work For Refractors?
Oct
17
answered How Does a Refractor Telescope Work?
Oct
16
awarded  Custodian
Oct
16
reviewed Approve How powerful a telescope would allow me to view the astronauts aboard ISS do a space-walk?
Oct
16
comment How powerful a telescope would allow me to view the astronauts aboard ISS do a space-walk?
Well, it seems the angular resolution of a telescope can be approximated by the Rayleigh limit, which is 5.5/aperture in inches. So for 10 inch, this will be 0.55 arcseconds. And a quick search tells me that the ISS is about 37 arcseconds at 410km distance. So we get at least 67 clear ISS pixels out of the 10 inch telescope! Furthermore, using super-resolution techniques, we can achieve much better resolution than that.
Oct
16
revised How powerful a telescope would allow me to view the astronauts aboard ISS do a space-walk?
added 2 characters in body
Oct
16
revised How powerful a telescope would allow me to view the astronauts aboard ISS do a space-walk?
added 7 characters in body