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Sep
19
awarded  Teacher
Sep
17
reviewed Approve suggested edit on Which kind of properties can we get for cosmic ray particles hitting on an optical ccd?
Sep
16
comment the metal distribution in our solar system
@Joel you are answering my question?
Sep
16
revised Which kind of properties can we get for cosmic ray particles hitting on an optical ccd?
added 127 characters in body; edited title
Sep
16
revised Which kind of properties can we get for cosmic ray particles hitting on an optical ccd?
added 94 characters in body; edited title
Sep
16
asked Which kind of properties can we get for cosmic ray particles hitting on an optical ccd?
Sep
12
comment the metal distribution in our solar system
could you please give a reference about the first question?
Sep
12
comment the metal distribution in our solar system
@dim23 The metals that are forming in the sun come from nuclear fusion? nuclear fusion of the sun? not necessarily. And what is the origin of the metals in, say, our earth?
Sep
12
asked the metal distribution in our solar system
Sep
10
comment what is the metal distribution in our universe
I revised my post in order to make it clear. My question for one kind of metal element, what is its distribution? Different metals should have different positions.
Sep
10
revised what is the metal distribution in our universe
added 53 characters in body
Sep
9
asked what is the metal distribution in our universe
Sep
9
comment The RA and Dec of lunar poles
It is empty here. en.wikipedia.org/wiki/Poles_of_astronomical_bodies
Sep
9
comment What can a lunar-based telescope do?
ps:anybody knows where does the moon's north pole point at? A general position is OK. I asked this question before, but nobody knew. astronomy.stackexchange.com/questions/5900/…
Sep
9
comment What can a lunar-based telescope do?
If a meteorite hits a position very close to the telescope and the telescope is working(uncovered), the telescope may be affected.
Sep
7
comment What can a lunar-based telescope do?
@Wayfaring the moon-earth distance changes all the time. The effect of an unstable baseline could be removed?
Sep
7
asked What can a lunar-based telescope do?
Aug
24
accepted What is the farthest object we've been able to bounce signals off of to date?
Aug
7
comment how does Kepler stop exposure after a 5 minuate or 30 minute cadence time?
How to remove the photons which arrive in that 0.52s? Every quarter we can observe 160000 unique sources and there are repeated sources between different quarters. I can not find a value that gives how many sources we have observed in the 17 quarters.
Aug
7
asked how does Kepler stop exposure after a 5 minuate or 30 minute cadence time?