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1 vote
3 answers
121 views

Could space time curve from the vantage point of earth and out into the universe, and would d = 1 / P in that case give false estimates?

The seventeenth century saw a revolution in astronomy. The invention of the telescope and the acknowledgement of the heliocentric system triggered a race amongst astronomers to measure the parallax of ...
memex's user avatar
  • 101
4 votes
1 answer
277 views

In layman's terms, why do we put the "time" in space-time?

What does "time" mean in the term space-time? I am trying to understand why anything that travels through space, from a proton to massive galaxies, is always referred to as traveling in space-time, ...
Ravi's user avatar
  • 43
3 votes
1 answer
63 views

Do astronomers, in principle, have more information about older phenomena than younger?

The further away we see, the older states of the world we observe. And the volume of the part of space which is observable, increases by the square of the distance to it. So there should basically be ...
LocalFluff's user avatar
  • 11.4k