User benrg

47 votes

Accepted

How do we know that black holes are spinning?

answered Sep 14, 2019 at 0:16

24 votes

Is there anything currently 46 billion light years away from Earth that we can see?

answered Jul 24, 2022 at 3:45

23 votes

From an outsider's perspective, how can a black hole grow if nothing ever crosses the event horizon?

answered Sep 29 at 20:16

14 votes

Could there really be a preferential direction to the speed of light?

answered Nov 1, 2020 at 6:12

12 votes

Accepted

How is the Cosmic Microwave Background so big?

answered Sep 24 at 18:47

12 votes

Does a measuring stick with a size of a billion lightyears in intergalactic space keep the same length in expanding space?

answered Sep 9, 2022 at 0:06

8 votes

Accepted

In an isolated binary system, can the expansion of the universe balance out collapsing orbit due to gravitational waves?

answered Oct 19, 2021 at 23:27

8 votes

Is the age of the Universe really 13.8 billion years?

answered Jan 4, 2021 at 20:06

7 votes

How do we know the expansion of the universe is not centered around our position?

answered May 24 at 7:17

6 votes

Is there a logical reason why we see no back and forth aberration effects when observing binary stars?

answered Nov 6, 2022 at 4:48

6 votes

Is it "nonsense to even talk about" objects outside the observable universe not having gravitational influence on us? (finite speed of gravity)

answered Sep 1, 2022 at 17:52

6 votes

Why is the observable Universe larger than its age would suggest?

answered Aug 10, 2020 at 17:24

5 votes

Accepted

Why is the Cosmic Microwave Background at the same distance no matter the direction we look?

answered Aug 12, 2020 at 19:34

5 votes

How far away are objects whose light will never reach us, because of the expansion of the universe?

answered Oct 8, 2020 at 22:24

5 votes

Confused about rubber sheet analogy!

answered Nov 10, 2020 at 23:25

5 votes

Do black holes "store" ancient light?

answered Jul 20, 2022 at 16:37

5 votes

Accepted

Minimum size of closed universe that satisfies ΩK < 0.005

answered Oct 20, 2021 at 19:50

5 votes

In relativity why does matter bend spacetime in a downward direction

answered Nov 7, 2021 at 5:14

5 votes

Why would galaxies (and galaxy clusters) be unaffected by the expansion of space?

answered Oct 8, 2022 at 20:29

5 votes

Why are there not a whole number of solar days in a solar year?

answered Apr 10 at 4:56

4 votes

Gravitational waves vs. "normal gravity"

answered Nov 18 at 8:45

4 votes

How does the hypothesis of the "inconstant Hubble constant" solve the current crisis in cosmology?

answered Nov 2, 2021 at 21:44

4 votes

In km/h, what actually is the "speed" of Andromeda away from us: cosmologically?

answered Sep 18, 2022 at 22:10

4 votes

Does the twin paradox work in an almost empty universe?

answered Feb 2, 2021 at 20:06

4 votes

Shouldn't the estimate of the universe's age be higher, not lower, after the attractive strength of gravity is taken into account?

answered Mar 3, 2021 at 16:52

4 votes

Accepted

Calculating the present comoving distance or light travel distance of distant objects when only one value is given?

answered Oct 12, 2021 at 19:59

4 votes

How are younger objects outside our observable universe when the older CMB is an observer's temporal "edge"?

answered Sep 8, 2020 at 3:51

4 votes

Must time pass more slowly, relative to our inertial reference frame, inside galaxies that are currently located at half way to the Hubble Horizon?

answered Sep 10, 2020 at 3:07

3 votes

Can an event horizon form with the observer already inside?

answered Aug 8, 2020 at 19:16

3 votes

Does time also pass more slowly for a galaxy that is traveling at relativistic speeds, where the speed difference is due to Hubble expansion?

answered Sep 16, 2020 at 20:55

Stack Exchange Network

68 Answers

How do we know that black holes are spinning?

Is there anything currently 46 billion light years away from Earth that we can see?

From an outsider's perspective, how can a black hole grow if nothing ever crosses the event horizon?

Could there really be a preferential direction to the speed of light?

How is the Cosmic Microwave Background so big?

Does a measuring stick with a size of a billion lightyears in intergalactic space keep the same length in expanding space?

In an isolated binary system, can the expansion of the universe balance out collapsing orbit due to gravitational waves?

Is the age of the Universe really 13.8 billion years?

How do we know the expansion of the universe is not centered around our position?

Is there a logical reason why we see no back and forth aberration effects when observing binary stars?

Is it "nonsense to even talk about" objects outside the observable universe not having gravitational influence on us? (finite speed of gravity)

Why is the observable Universe larger than its age would suggest?

Why is the Cosmic Microwave Background at the same distance no matter the direction we look?

How far away are objects whose light will never reach us, because of the expansion of the universe?

Confused about rubber sheet analogy!

Do black holes "store" ancient light?

Minimum size of closed universe that satisfies ΩK < 0.005

In relativity why does matter bend spacetime in a downward direction

Why would galaxies (and galaxy clusters) be unaffected by the expansion of space?

Why are there not a whole number of solar days in a solar year?

Gravitational waves vs. "normal gravity"

How does the hypothesis of the "inconstant Hubble constant" solve the current crisis in cosmology?

In km/h, what actually is the "speed" of Andromeda away from us: cosmologically?

Does the twin paradox work in an almost empty universe?

Shouldn't the estimate of the universe's age be higher, not lower, after the attractive strength of gravity is taken into account?

Calculating the present comoving distance or light travel distance of distant objects when only one value is given?

How are younger objects outside our observable universe when the older CMB is an observer's temporal "edge"?

Must time pass more slowly, relative to our inertial reference frame, inside galaxies that are currently located at half way to the Hubble Horizon?

Can an event horizon form with the observer already inside?

Does time also pass more slowly for a galaxy that is traveling at relativistic speeds, where the speed difference is due to Hubble expansion?