Question

a group of students is using big bang theory to explain how the universe formed. according to big bang theory, how did the universe form? move the events into order in the table. event 1 2 3 4 first stars form first galaxies form hydrogen atoms form universe begins expanding

Explanation:

Step1: Initial event in Big - Bang

The Universe begins expanding right after the Big - Bang singularity. So the first event is "Universe begins expanding".

Step2: Formation of light elements

After expansion, hydrogen atoms form as the first stable elements. So the second event is "Hydrogen atoms form".

Step3: Formation of stars

Gravity causes hydrogen to clump together and form the first stars. So the third event is "First stars form".

Step4: Formation of galaxies

Stars then group together to form the first galaxies. So the fourth event is "First galaxies form".

Answer:

1	2	3	4