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 Yearling
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Apr
28
comment Did atoms in human body indeed come from stars?
@RobJeffries - The s-process occurs within stars, doesn't it? So the elements are created in stars. That's what I'm saying. Also, I'm not saying the supernova event creates the elements, it just throws them into space. You'll agree that at the time a supernova occurs it holds a lot of heavy elements and that a very high mass of it is ejected into space?
Apr
28
comment Did atoms in human body indeed come from stars?
@RobJeffries - Well, feel free to tell us where the elements heavier than hydrogen and helium come from, then, if it's not from stars. You do realize that in the beginning there was only hydrogen and helium, and all that happened since is the formation and destruction of stars, do you?
Feb
17
awarded  Yearling
Sep
30
comment What causes jets from newly born stars?
No, I didn't find this on Wikipedia, but other sources don't offer a good explanation either. Thanks for your answer.
Sep
29
answered Milky way: How do we know its appearance?
Sep
29
asked What causes jets from newly born stars?
Sep
22
comment Is there matter forming in the inflationary space?
@Wayfaring - Well, the Steady State Model may have had some supporters in its time, but it was definitely discredited with the discovery of the CMB in 1965. I'm a bit surprised someone still wants to talk about it :-).
Sep
19
comment How certain are we about the universe's flatness?
What I meant was: can we account the 1% as completely observational error, or are there voices for a curved universe, when we can reduce the error? Suppose we now see +1/-1 %, but in the future +1/-0.5 % and even further in the future +1/-0.2 %. Doesn't this hint to a curved universe, when looked at at larger scales (than we can observe)?
Sep
19
revised Is there matter forming in the inflationary space?
added 321 characters in body
Sep
19
revised Is there matter forming in the inflationary space?
added 321 characters in body
Sep
19
revised Is there matter forming in the inflationary space?
added 172 characters in body
Sep
19
answered Is there matter forming in the inflationary space?
Sep
19
asked How certain are we about the universe's flatness?
Sep
19
comment How can light reach us from 14 billion light years away?
That's a hypothetical number you're using as an example. The expansion occurs at escape velocity, and that's lower than $c$. The explanation comes from the inflation epoch.
Sep
19
comment How can light reach us from 14 billion light years away?
@Scottie - No. The study of the universe is cosmology. Astronomy is the study of the life of stars, which is a much smaller field. Astronomy doesn't include the Big Bang, the CMB or the formation of early galaxies, for instance.
Sep
18
asked Free neutrons and stellar nucleosynthesis
Sep
18
awarded  Student
Sep
17
comment How fast is a comet moving when it crosses Earth's orbit?
It depends. An object's speed is related to the length of it's orbit, and this varies greatly. See Kepler's Laws.
Sep
17
comment Milky Way Formation
Could you summarize it here? If the video is ever removed your answer becomes useless.
Sep
17
awarded  Commentator