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 Yearling
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Dec
4
comment Without using absolute magnitudes or isochrones, how might we tell a star's age and evolutionary status?
You say: "You can plot the star in the log g vs Teff plane and compare it with theoretical isochrones appropriate for the star's metallicity." so you are using isochrones. The question is "Without using isochrones".
Dec
3
comment Without using absolute magnitudes or isochrones, how might we tell a star's age and evolutionary status?
@RobJeffries which other ways that are not indirectly based on isochrones?
Dec
1
answered What are the nearest galaxies I can observe?
Dec
1
comment Roche Limit for Earth-like body around Earth-like body
@Py-ser True, it does not answer it, because Earth is not exactly rigid (no celestial body is).
Nov
27
awarded  Student
Nov
26
comment Roche Limit for Earth-like body around Earth-like body
Wikipedia gives generalities as "Rigid" and "Fluid" but not an actual distance for Earth near Earth. It gives not even a single figure for Moon near Earth.
Nov
26
comment Roche Limit for Earth-like body around Earth-like body
How much? I want to know which is the distance for such a Roche Limit, please.
Nov
24
comment moonless night and lunar phase
Depending on your horizon and the quality of your instruments, you may have three moonless nights. Check en.wikipedia.org/wiki/Hilal_(crescent_moon)
Nov
24
asked Roche Limit for Earth-like body around Earth-like body
Nov
22
awarded  Yearling
Oct
29
comment What happens to photons that don't interact with something?
Some simple maths show a photon frecuency approaches zero asintotically, so it will never reach that.
Oct
28
answered What happens to photons that don't interact with something?
Sep
30
awarded  Explainer
Aug
11
comment What would the effects be on Earth if Jupiter was turned into a star?
Please, double check the question. It is not about if it is possible or not. It is about what would happen if it happens (by unspecified methods). Discussions about possible or impossible are out of the question.
Aug
7
comment What would the effects be on Earth if Jupiter was turned into a star?
@HDE226868 Aboslutely False. We will not have any problems with gravity if Jupiter "magically" (as expressed by the OP) becomes a star with its own mass.
Aug
7
comment What would the effects be on Earth if Jupiter was turned into a star?
@HDE226868 The link is the reference for the mass relation between Sun and Jupiter
Aug
6
answered What would the effects be on Earth if Jupiter was turned into a star?
Aug
5
comment Astronomy questions I wondered for hours
Accelerated expansion: This is also a question that has been asked before. Please use the search button.
Aug
5
comment Astronomy questions I wondered for hours
Proof of big bang: that is a different question. Please ask it separatedly. Or better, use the Search engine of this site.
Aug
5
comment Astronomy questions I wondered for hours
No, it can not happen in the middle of your room in empty space, because Big Bang did not happen in empty space. It was the start of all space. There were no empty space around, no void around, because there is no around. The material did not come from any place. The Big Bang was the origin of all material and energy. And no, nothing could cause it, because any cause must be before its consequence, and Big Bang has no before. It is the start of time.