Linked Questions

2
votes
0answers
49 views

Lorentz invariance of the CMBR [duplicate]

From the Wikipedia entry on the CMBR dipole anisotropy (emphasis mine), From the CMB data it is seen that the earth appears to be moving at 368±2 km/s relative to the reference frame of the CMB (...
0
votes
0answers
47 views

What does velocity relative to CMB mean? [duplicate]

I've see some velocities such as that of the Sun quoted as "relative to the cosmic microwave background"? How is this different to measuring velocities relative to that old, discredited idea, the ...
0
votes
0answers
36 views

Is there a standard of rest in the universe? [duplicate]

If you measure the cosmic background radiation you will find that in any direction it is roughly the same. However, if you were to travel near the speed of light relative to the Earth in a particular ...
16
votes
5answers
2k views

Can we find actual rest mass of things on Earth

Earth moves around the Sun and the Sun moves around the galaxy and the galaxy moves with unknown speed and direction. We have speed so the mass of us all altered. Can we know the real rest mass? If ...
5
votes
7answers
2k views

Why a type of motion is relative and another is not? [closed]

Two scientists are completely isolated in two different boxes: First box moves uniformly straight (in a perfect space). Second box rotates uniformly (also in a perfect space). The scientists have ...
11
votes
2answers
639 views

Do the standard cosmology models spontaneously break Lorentz symmetry?

In standard cosmology models (Friedmann equations which your favorite choice of DM and DE), there exists a frame in which the total momenta of any sufficiently large sphere, centered at any point in ...
6
votes
3answers
1k views

Understanding Mach's principle: What does it answer?

What is the question that Mach tried to address in his principle? I mean, we know how to detect the inertial and non-inertial frames (by Newton’s law). Once this is understood we also see that due to ...
0
votes
5answers
1k views

Can you tell your absolute speed in space?

Normally in relativity your speed can only be known relative to another object, given that as one approaches light speed more energy is required to accelerate faster, based on the energy consumption ...
0
votes
1answer
1k views

What distance does one travels in his lifetime? [closed]

I think this isn't answerable without having point of reference from which speed at which earth travels in space, however if I am wrong the please give absolute distance. Considering that earth spins ...
1
vote
2answers
304 views

Does the Cosmic Microwave Background falsify relativity of velocity?

In special relativity velocity is relative and there is no absolute rest frame . However the cosmic microwave background radiation does have a rest frame. Earth is moving with 328 km/s with respect to ...
1
vote
3answers
690 views

Why can't we find a true inertial frame?

From one book, I read that if we release a ball horizontally on earth, its velocity does change in very accurate observations. If we track its motion, we get full information of its motion (incl. ...
7
votes
1answer
358 views

What frame of reference in the universe is (most) rotation-neutral?

I've read on Newton's Bucket and the pseudo-special frame of reference bound to CMB but I didn't find anything that would bind the two well - so, is the CMB frame "rest frame" for a spinning body not ...
3
votes
1answer
582 views

Why is the cosmological “Axis of evil” surprising?

I know this is probably a silly question but i'm not sure I understand why it is special that radiation is cooler on one side of our solar system than the other. It seems like it would indicate that ...
2
votes
4answers
199 views

Would possibility of instant communication break physics? [duplicate]

I recently read a sci-fi book, where some (very few) people can communicate telepathically, which happens to be instantaneous. So, every spaceship has a crew member who telepathically communicates ...
0
votes
3answers
677 views

If time is relative, how could time pass? [duplicate]

EDIT: I appreciate people who answered below. But it does not answer the question, so I will clarify my questions: -It seems like everyone is saying that time passing is actualized by physical ...

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