What is the speed of the cosmic microwave background radiation?

Based on the 2013 data, the universe contains 4.9\% ordinary matter, 26.8\% dark matter and 68.3\% dark energy. On 5 February 2015, new data was released by the Planck mission, according to which the age of the universe is 13.799±0.021 billion years old and the Hubble constant was measured to be 67.74±0.46 (km/s)/Mpc.

What does the microwave background radiation prove?

The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background”, or CMB.

How do we know the speed of the galaxy?

The speed of light has a constant value of 300,000 km/sec. So, to determine the velocity of a galaxy (in km/sec) from its spectrum, we simply measure the wavelength shift of a known absorption line and solve for v.

What do microwaves tell us about the universe?

Microwaves are invisible to the naked eye so they cannot be seen without instruments. Created shortly after the universe came into being in the Big Bang, the CMB represents the earliest radiation that can be detected. Astronomers have likened the CMB to seeing sunlight penetrating an overcast sky.

What was the peak wavelength of the background radiation?

In cosmology, the cosmic microwave background radiation is a form of electromagnetic radiation discovered in 1965 that fills the entire universe. It has a thermal 2.725 kelvin black body spectrum which peaks in the microwave range at a frequency of 160.4 GHz, corresponding to a wavelength of 1.9 mm.

How do physicists detect the motion of galaxies?

Almost all measurements of motion in astronomy make use of a law of physics called the Doppler effect. It is common to do this using a long-slit spectroscope, which measures the shifts in a single spectral line across the galaxy.

What is the speed of our galaxy in the space?

And how fast is the Milky Way Galaxy moving? The speed turns out to be an astounding 1.3 million miles per hour (2.1 million km/hr)! We are moving roughly in the direction on the sky that is defined by the constellations of Leo and Virgo.

Why is the microwave part in cosmic microwave background quizlet?

As the universe has expanded significantly since the big bang we expect to see this relic radiation from the big bang (emitted at Recombination) isotropically across the sky and at much longer microwave wavelengths compared to when it was emitted. This is why it is called the cosmic microwave background.