457 reputation
19
bio website
location
age
visits member for 1 year, 5 months
seen 5 hours ago

Mar
9
comment what is the metal distribution in our universe
@Rob Let me put this way. For one particular kind of element, what is their distribution in the whole universe? All the natural elements have been found in stars?
Feb
28
comment How can we tell that a short-period binary is tidally locked?
Any reference papers about "Any low-mass binary with an orbital period of less than a few days is almost certainly tidally locked." ? How to tell tidally locked binaries are stable all the time? A giant flare may affect their motions in a short time, like glitch in pulsars.
Feb
28
asked How can we tell that a short-period binary is tidally locked?
Feb
2
comment Why do not we use optical telescopes to study cosmic rays directly?
@Rob so it should happen that occasionally the background of ccd images taken by an optical telescope may become bright suddenly? The detector of VERITAS, CTA and HESS are CCDs?
Feb
1
comment Why do not we use optical telescopes to study cosmic rays directly?
@so optical telescopes do receive the signal of cosmic rays, I mean blue light, when they observe other targets?
Jan
30
comment Why do not we use optical telescopes to study cosmic rays directly?
@ I mean optical telescopes could collect blue light two. Why do we build a different kind of telescope? We can use optical telescopes directly.
Jan
30
comment Why do not we use optical telescopes to study cosmic rays directly?
Since HESS, CTA and VERITAS collect blue light, why can not we use optical telescopes to collect blue light and study cosmic rays directly? Why do we build different kinds of telescopes?
Jan
30
comment Why do we have so few neutrinos to study?
The cross section is so small that I doubt whether it is useful to put neutrino detectors in mines. How to know neutrinos are from a particular source, say, our sun?
Jan
30
revised Why do not we use optical telescopes to study cosmic rays directly?
edited body
Jan
30
asked Why do we have so few neutrinos to study?
Jan
30
asked Why do not we use optical telescopes to study cosmic rays directly?
Jan
25
comment How do we know an event is a gamma-ray burst?
Thanks. Your comment and the reference paper help, but not much. The only way now we can tell an event is a grb is from its explosion? All the GRBs were captured in Gamma ray band initially?
Jan
20
comment the initial astrometry calibration for a telescope
how about larger non-amateur telescopes? They should be the same?
Jan
19
comment the initial astrometry calibration for a telescope
So the telescope should observe some real targets to calibrate, right? Then the reference can be built.
Jan
18
comment the initial astrometry calibration for a telescope
Thank you. BUT it seems you answered nothing. How to REALIZE that? The telescope itself knows that?
Jan
15
asked the initial astrometry calibration for a telescope
Jan
3
awarded  Tumbleweed
Jan
3
awarded  Curious
Jan
2
comment landing on a comet is more important than landing on an asteroid?
How to collect samples without landing on it? Philae will take sample back?
Jan
2
asked landing on a comet is more important than landing on an asteroid?