2007-11-23 22:01:43 · 3 answers · asked by clueless 1 in Science & Mathematics ➔ Astronomy & Space
For the first 300,000 years after the universe began its temperature was greater than 4,000 degress Kelvin. At temperatures above 4,000 K the universe was filled with little more than ionized hydrogen atoms which made up a dense, opaque plasma. Light could not penetrate that plasma. At the 300,000 year mark the temperature had decreased to a point where the plasma faded away and the universe became transparent to light.
2007-11-23 22:27:48 · answer #1 · answered by Anonymous · 2⤊ 0⤋
From about 3 minutes after the large bang to about 377,000 years after, there changed into little or no change contained in the chemical composition of the universe. on the proper of this time, the mass fractions were about seventy six.13% hydrogen [*], 23.87% helium, and extremely tiny strains of lithium, beryllium, and perchance boron. [* consisting of about 0.0027% deuterium and 0.000012% hydrogen-3.]
2016-10-24 23:49:55 · answer #2 · answered by ? 4 · 0⤊ 0⤋
There was no light in the universe until the first stars lit up,before that nothing existed that could have impede any electro magnetic radiation.
2007-11-24 01:14:06 · answer #3 · answered by Billy Butthead 7 · 0⤊ 1⤋