What are two pieces of evidence of the big bang and that the universe is expanding?

Answer 1

1) Red shift seen in all distant galaxies, whose size is propotional to the galaxy's distance from us.

2) Existence, isotropy, and spectrum of the cosmic microwave background radiation.

Answer 2

One important piece of evidence that the Universe is expanding is the Doppler shift.

The "Big Bang" is merely an extrapolation into the past. It is assumed that the density of the Universe, as well as its mean temperature, must have been higher in the past. Up to a certain point, this can be observed, by looking into the past, i.e., seeing radiation that has been travelling through the Universe for billions of years.

Answer 3

The first piece of evidence for the Big Bang theory was the expansion of the universe. The second piece of evidence is called 'Cosmic background radiation'.

There are, in addition, many others.

Answer 4

One important piece of evidence that the Universe is expanding is the Doppler shift.

The "Big Bang" is merely an extrapolation into the past. It is assumed that the density of the Universe, as well as its mean temperature, must have been higher in the past. Up to a certain point, this can be observed, by looking into the past, i.e., seeing radiation that has been travelling through the Universe for billions of years.

One important piece of evidence that the Universe is expanding is the Doppler shift.

The "Big Bang" is merely an extrapolation into the past. It is assumed that the density of the Universe, as well as its mean temperature, must have been higher in the past. Up to a certain point, this can be observed, by looking into the past, i.e., seeing radiation that has been travelling through the Universe for billions of years.

One important piece of evidence that the Universe is expanding is the Doppler shift.

The "Big Bang" is merely an extrapolation into the past. It is assumed that the density of the Universe, as well as its mean temperature, must have been higher in the past. Up to a certain point, this can be observed, by looking into the past, i.e., seeing radiation that has been travelling through the Universe for billions of years.

One important piece of evidence that the Universe is expanding is the Doppler shift.

The "Big Bang" is merely an extrapolation into the past. It is assumed that the density of the Universe, as well as its mean temperature, must have been higher in the past. Up to a certain point, this can be observed, by looking into the past, i.e., seeing radiation that has been travelling through the Universe for billions of years.

Answer 5

The 2 pieces of evidence that prove the Big Bang theory is the red shift of distant galaxies and also the CMBR (the Cosmic Microwave Background Radiation.)

The red shift proved that distant galaxies were moving away from us and the further the galaxy the faster it was moving away. The universe must be expanding and thus in the past it must have been smaller.

The CMBR proves that the early universe was extremely hot. As the universe grew the temperature fell.

Answer 6

That our Universe is expanding is irrefutably proven by the fact that, the further away a galaxy is from our Earth, the greater the red-shift of the light coming from that galaxy.

The Big Bang Theory is the only one to explain the spectrum and isotropic nature of the cosmic microwave background radiation; and the respective percentages of the elements hydrogen, helium, and lithium in our Universe. All other hypotheses have to say, "We're not sure why that's happening, it just does."

Answer 7

Redshift of distant galaxies, attributed to the Doppler effect; and cosmic background radiation which agrees with certain predictions of the big bang model. I suggest you read the Wikipedia article on the Big Bang for more details.

Answer 8

The big bang theory supports the observations of the expanding universe and the
cosmic microwave background radiation, as well as a number of other obervations.

Real science doesn't look for evidence to support theories. It works the other way around.

Answer 9

Observation of the universe, using telescopes.

Galaxies and stars are not static. They are moving in relation to each other. This movemnet can be detected by doppler shift in the observable light.

The universe is expanding.

Therefore if it is expanding, it must have expanded from some point.

In the relatively short time that we have made scientific observations, the distance over time can be measured. So simply reversing the time and distance, the point and time of the point can be calculated. A big bang.

Answer 10

First and most impressive piece of evidence of this theory is you, me and even everything that we see around us. Everything in this universe is made up of matter that comes from the very first second of big bang. And I believe the cosmic background radiation now become the landmark of the bigbang theory, the radiation left from the very early stage of our universe