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Universe
New post in Universe
Is spacetime discrete or continuous?
December 23rd, 2021
discrete
quantum-gravity
universe
string-theory
spacetime
As the universe ages, will we see more stars or less?
August 1st, 2022
space-expansion
universe
cosmology
observable-universe
Is the total energy of the universe constant?
August 1st, 2022
universe
energy-conservation
cosmology
energy
general-relativity
If the Universe is Flat, has Finite Mass/Energy, and is Simply Connected, Then there MUST be an Edge, Mustn't there?
August 1st, 2022
topology
universe
spacetime
cosmology
general-relativity
Am I attracting Pluto?
November 18th, 2020
universe
gravity
forces
What is meant when it is said that the universe is homogeneous and isotropic?
August 1st, 2022
universe
general-relativity
cosmology
spacetime
metric-tensor
How do scientists know the min limit of temperature is -273 degree celsius?
August 1st, 2022
physical-constants
universe
temperature
thermodynamics
If the universe is expanding, what is it expanding into?
August 28th, 2020
energy-conservation
universe
big-bang
space-expansion
faq
How can something finite become infinite?
June 17th, 2021
cosmology
universe
big-bang
singularities
How far away must a galaxy be for its light never to reach us due to the expansion of the universe?
March 31st, 2020
faster-than-light
cosmology
universe
space-expansion
How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago?
September 21st, 2020
cosmology
universe
big-bang
space-expansion
faster-than-light
Dumbed-down explanation how scientists know the number of atoms in the universe?
July 11th, 2020
cosmology
universe
atoms
estimation
Does the amount of gravitational potential energy in the universe increase as it expands?
August 1st, 2022
general-relativity
cosmology
energy-conservation
universe
space-expansion
Can the Hubble constant be measured locally?
December 24th, 2020
general-relativity
universe
locality
Could the observable universe be bigger than the universe?
April 4th, 2021
cosmology
universe
observable-universe
What is spacetime (simple explanation)?
September 24th, 2020
spacetime
relativity
universe
Does everything orbit around some universal "center of mass"?
August 1st, 2022
universe
orbital-motion
cosmology
Does the universe have a center?
April 8th, 2021
big-bang
universe
spacetime
cosmology
Why does a flat universe imply an infinite universe?
January 6th, 2021
topology
curvature
general-relativity
cosmology
universe
Shape of the universe?
August 1st, 2022
cosmology
compactification
topology
universe
general-relativity
Why is the mapped universe shaped like an hourglass?
August 1st, 2022
universe
astronomy
astrophysics
What does the concept of an "infinite universe" actually mean?
June 19th, 2021
cosmology
spacetime
terminology
universe
definition
How long ago was the Universe small enough for interstellar travel?
August 1st, 2022
universe
estimation
big-bang
cosmology
space-expansion
Stephen Hawking says universe can create itself from nothing, but how exactly?
August 1st, 2022
gravity
cosmology
spacetime
universe
big-bang
Did time exist before the Big Bang and the creation of the universe?
August 1st, 2022
spacetime
big-bang
universe
time
cosmology
Does the universe have a fixed centre of mass?
August 1st, 2022
universe
cosmology
spacetime
mass
Is the total energy of the universe zero?
August 8th, 2020
universe
general-relativity
cosmology
energy-conservation
What is known about the topological structure of spacetime?
April 6th, 2020
universe
spacetime
general-relativity
topology
differential-geometry
Is spacetime simply connected?
October 13th, 2020
universe
topology
general-relativity
spacetime
differential-geometry
How long will the Universe's hydrogen reserves last for?
August 1st, 2022
universe
cosmology
astrophysics
hydrogen
big-bang
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