Physics

The flatness problem states that a. the density of the Universe is very close to the critical ...

Started by SO00

If galaxy A is four times more distant than galaxy B, then according to the Hubble law, galaxy A ...

Started by panfilo

If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 ...

Started by Cooldude101

Possible equations (choose the correct one): =1012/H; H=v/d. If gravity is unimportant and H equals ...

Started by WhattoUnderstand

What observational evidence supports the fact that our universe is static and unchanging? a. ...

Started by c0205847

Where did the cosmic microwave background (CMB) come from? a. photons emitted from the first ...

Started by jwb375

Why is the cosmic microwave background (CMB) so cold if the early Universe was so hot? a. Enough ...

Started by Pineapplelove6

Astronomers have found the center of the Universe to be located in a. Earth b. the Sun c. ...

Started by penguins

What observation has prompted astronomers to ponder the possible existence of dark energy? a. ...

Started by chandani

Astronomers believe that the hydrogen atoms in your body were created a. in the planets. b. ...

Started by vicky

How old is the Universe since the big bang? Pick the best answer according to radioactive dating in ...

Started by hbsimmons88

Which of the following types of Universe has no center and no edge? a. closed b. flat c. open d. ...

Started by swpotter12

If the Universe is truly flat, then what is the curvature and type of Universe? a. positive, open ...

Started by swpotter12

The Universe contains _____________________. a. 22.7 baryonic, 4.5 WIMPs, 72.8 dark energy b. ...

Started by gonzo233

How long is one Hubble time? a. 1/4 the age of the Universe b. 1/2 the age of the Universe c. ...

Started by abc

The ___________ are theories that unify the electromagnetic, weak, and strong forces at extremely ...

Started by imowrer

Observations of type Ia supernovae reveal that the expansion of the universe is speeding up because ...

Started by iveyjurea

If in every direction we point to a star, then the conundrum that the sky is dark is known as ...

Started by robinn137

Antiprotons and positrons are examples of ______________, which are not ordinary matter. Fill in ...

Started by fagboi

The redshifts of the galaxies imply that the Universe is expanding and that we are at the center. ...

Started by Mr3Hunna

Most of the elements heavier than helium were made during the first few minutes after the big bang. ...

Started by KWilfred

If the average density of the universe is less than the critical density, the Universe is open. ...

Started by jc611

If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the ...

Started by segrsyd

The inflationary theory of the Universe may explain why the background radiation is so isotropic. ...

Started by ENagel

The cosmic microwave background radiation was released shortly after the formation of the first ...

Started by JGIBBSON