What is Hubble time quizlet?
The Hubble time is. an estimate of the age of the universe based on the Hubble constant. Only $35.99/year. The cosmic background radiation comes from a time after the origin of the universe. when electrons began to recombine with nuclei to form atoms.
What is the Hubble time expressed as?
The Hubble time is expressed as: 1/H. moving at about 380 km/s toward Leo. What does the Hubble law imply about the history of the universe?
Why do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons?
Why do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons? Galaxies could not have formed as early as they did without dark matter gravitationally attracting ordinary matter and inducing galactic formation.
What did Edwin Hubble’s observations show quizlet?
According to the readings in “Big History” and the NASA/WMAP tutorial, what did Edwin Hubble’s observations show? a. That galaxies outside the Milky Way are systematically moving closer to us with a speed proportional to their distance to us.
Is Hubble constant constant in time?
But the “Hubble constant” itself is a misnomer. It has a value today that’s the same everywhere in the Universe, making it a constant in space, but it’s not a constant in time.
Why is dark matter important?
Understanding dark matter is important to understanding the size, shape and future of the universe. Understanding dark matter will also aid in definitively explaining the formation and evolution of galaxies and clusters. As a galaxy spins it should be torn apart.
What did Edwin Hubble do quizlet?
What did Edwin Hubble be the first to identify and what did he discover about galaxies? The first astronomer to identify other galaxies besides from the Milky Way Galaxy. By the year 1929, he had estimated the distance from Earth to 46 galaxies.
What could Hubble conclude about these galaxies quizlet?
Hubble observed that the light from all distant galaxies is red-shifted. Red shift happens when a light source is moving away from an observer. Since all the galaxies in the universe are red-shifted, they must all be moving away from Earth. Therefore, the universe must be expanding.