Comments on: End Of Days

By: Ruixuan Li

Ruixuan Li — Fri, 17 Feb 2017 06:48:56 +0000

helium is heavier tha hydrogen

By: Andrew L

Andrew L — Mon, 29 Aug 2016 23:10:36 +0000

I’m not a physicist but my basic understanding is that Gravity is a product of mass. The Sun is converting hydrogen to helium which is a more dense element but the overall mass of the sun doesn’t change. Density doesn’t effect Gravity does it? So I don’t see why an increase in density would cause gravity to increase.

By: mike schuh

mike schuh — Sat, 09 Jan 2016 00:47:07 +0000

I can see this happening but where does God come into all this.

By: James Harmer

James Harmer — Wed, 06 Jan 2016 23:44:41 +0000

That the inner edge of the Habitable Zone should expand as the Sun gradually warms up is obvious, but why does the outer edge of the Zone decrease ? Surely the whole Zone should just move outwards. How can the Sun get hotter and colder at the same time ?

By: Tino Koschinski

Tino Koschinski — Mon, 04 Jan 2016 19:25:44 +0000

I’m not entirely sure if that is the reasons but the amount of energy any object receives by the sun decreases by the square comparing to its distance. So while the sun is getting hotter – the inner edge of the habitable zone should be pushed outwards by a greater distance then the outer edge. And that should lead to a thinner habitable zone. I can’t think of a reason though why it would vanish to 0.

By: Elver S.S.

Elver S.S. — Sun, 03 Jan 2016 18:06:58 +0000

That makes three of us. The habitable zone graph seems to imply there are stars out there with no habitable zones.

By: Eric Charland

Eric Charland — Sun, 03 Jan 2016 15:05:47 +0000

Was going to ask the same question.

By: iustin

iustin — Sun, 03 Jan 2016 14:39:37 +0000

Question: why is the habitable zone getting thinner? Also, in the graph, there is a sudden change at around 3.5By. Is that when the CNO cycle kicked in? In any case, the lower boundary seems to gradually increase, but the outer boundary (too cold) sees significant regressions. That doesn’t make sense, if the sun is getting hotter. What do I miss?