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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.
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
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.
Aug
5
comment Astronomy questions I wondered for hours
This question appears to be off-topic because it is about religion, not science.
Aug
5
comment Astronomy questions I wondered for hours
This site is about science, not religion.
Aug
5
comment Astronomy questions I wondered for hours
Please copy the question here. Links can die, and thus render this question unusable for future readers.
Aug
4
comment Apogalacticon and Perigalacticon
"Sag DEG is roughly 10,000 light-years in diameter, and is currently about 70,000 light-years from Earth" en.wikipedia.org/wiki/Sagittarius_Dwarf_Spheroidal_Galaxy . We are not part of it.
Aug
4
comment Can there be an infinity of stars in the Universe?
This is a known fallacy.
Aug
4
comment Determining planetary positions on the celestial sphere by Right Ascension and Declination
What do you exactly need? "Planetary positions on the celestial sphere" are one thing and "position[s] on our solar system" are another. The first is two-dimensional on a projected sphere and the second is three-dimensional.
Jul
24
comment Could dark matter particles be unstable?
en.wikipedia.org/wiki/Baryonic_dark_matter
Jul
24
comment Could dark matter particles be unstable?
@Aaron this is not how Dark Matter is defined in Astronomy, when we make rotation profiles for galaxies. Dark matter is ordunary matter, but just dark=unobservable.
Jul
17
comment The RA and Dec of lunar poles
@questionhang Just use Cassini's Laws. If you have trouble with them that's another question. This one is over.
Jul
17
comment The RA and Dec of lunar poles
@questionhang Double check the link I have just provided. The angle between the ecliptic and the lunar equator is always 1.543° and the rotation axis of the Moon precesses with the same rate as its orbital plane, but is 180° out of phase (see Cassini's Laws). This is all you need. You just need to follow the link to Cassini's Laws. Did you really investigate before asking?
Jul
16
comment The RA and Dec of lunar poles
@questionhang en.wikipedia.org/wiki/Orbit_of_the_Moon#Inclination
Jul
11
comment Why is right ascension measured in hours?
@Dieudonné No, you can not define a time unit as an angle, they are different magnitudes. You can, instead, define a time unit by using an angle: a sidereal second is the time the Earth rotates 360/(24*60*60) degrees in reference to the fixed stars in average.
Jul
10
comment What is the difference between a dwarf spheroidal galaxy and a globular cluster?
Please note that I referred to be bound inside a larger body. SMC and LMC are not inside Milky Way.