Consider three periods in the history of the Universe: one million years after the Big Bang (age = 1 million years), about five billion years ago (age = 9 billion years), and today. What is the ranking in the expansion rate of the Universe in these three period, from fastest to slowest expansion: O 1 million years, today, 9 billion years. O today, 1 million years, 9 billion years. today, 9 billion years, 1 million years. O 1 million years, 9 billion years, today.

Q: Think of our Milky Way Galaxy as a flat circular disk of diameter 100,000 light-years. Suppose we…

A: There are many units to calculate length. Bigger units like astronomical unit, parsec, etc are used…

Q: Scientific models are often built in stages or layers, starting with a single idea. Which idea…

A: The Big Bang is a cosmological model of the observable universe that describes how the cosmos…

Q: Suppose we find an Earth-like planet around one of our nearest stellar neighbors, Alpha Centauri…

A:

Q: So if our universe is about 15 billion years old. Do we think this because we can't see farther away…

A: We are known the age of universe. We are given that age of universe is about 15 billion years. There…

Q: given: a (distance to center of galaxy in AU) = 1,717,914,439 AU P (suns orbital period in years)…

A: Given: a (distance to center of galaxy in AU) = 1,717,914,439 AU P (suns orbital period in years) =…

Q: What is the evidence that the universe was very uniform during its first 400,000 years?

A: The universe was formed from a big explosion called Big Bang. In the beginning, everything was…

Q: Calculate the age of the universe when its temperature was 10¹¹ K.

A: The universe was once part of a singularity of very high density and temperature. All the forces and…

Q: What if the Andromeda galaxy were to disappear How long before we would notice?

A: About 2.5 million light-years separate our solar system from the Andromeda galaxy. If it vanished,…

Q: When we observe the most distant galaxies what are we looking at?

A: Question: When we observe the most Distant galaxies what are we looking at.

Q: Let's say that the number density of galaxies in the universe is, on average, 3 × 10–68 galaxies/m3.…

A: Given :number density of galaxies, n = 3 × 10–68 galaxies/m3            Observable distance by…

Q: What do you think of the statement: The universe has no center and no edge (or boundary)?

A: The description of the universe that it has no centre and no edge actually tells a lot about the…

Q: What is the the steady-state theory of the universe, and why was it abandoned? What theory do we…

A: A per the Steady-State theory, the universe is always expanding but it is maintaining a constant…

Q: When the universe was approximately one second old its size grew by a factor of 10 to the power of…

A: When the universe was approximately one second old its size grew by a factor of 10 to the power of…

Q: The number density of air in a child's balloon is roughly the same as sea level air, 1019…

A: Number of particles in the balloon is, N=nVN=n×43πR3

Q: Your astronaut twin brother is exploring a planet of a star far out in space. Ignoring the time…

A: Brother's age 2 years for 1 year of my age⇒ t∘=t   ,     t'=2t

Q: If a galaxy is 9.3 Mpc away from Earth and recedes at 508 km/s, what is H, (in km/s/Mpc)? |km/s/Mpc…

A: velocity, v=508 km/s distance, d=9.3 Mpc=9.3×3.086×1019 Km=28.7×1019 Km. Hubble constant,…

Q: ne cosmic "dark ages" represent that time in the history of the universe hen:

A: The question can be solved as follows

Q: What is the evidence that the universe was very uniform during its first 400,000 years?

A: The evidence of the uniform nature is explained by particle physics. Before the formation of the…

Q: In the twin paradox, we find that the Earthbound twin ages more than the twin traveling in the…

A:

Q: Most of the stars we can see with the unaided eye in our night sky are hundreds or even thousands of…

A: The question is asking us to comment on the feasibility and practicality of visiting, communicating…

Q: What is the Big Bang? What evidence do we see in the Universe that everything-which-exists exploded…

A: Bigbang - It is presumably more like a balloon being gust up. A balloon begins small and dilates…

Q: Calculate the age of the universe when the temperature was 10¹ K.

A: The age of the universe when the temperature was 1013 K. Given, TemperatureT=1013 K

Q: Explain the Higher-Order Systems?

A:

Q: Compare the values of the number of grains of sand in all earth’s beaches with the number of stars…

A:

Q: Let's say that the number density of galaxies in the universe is, on average, 3 × 10–68 galaxies/m3.…

A:

Q: D

A: Solution: The four model are as follows, Critical Accelerating Coasting Recollapsing The present…

Q: If the value of the Hubble constant is 70 kilometers per second per Mpc, then what is the Hubble…

A: Given information: The value of the Hubble's Constant (H0) = 70 km/s/Mpc We know that 1 Mpc =…

Q: Was the Big Bang an explosion? Explain your answer.

A: the Big Bang wasn't an explosion that destroyed things.

Q: Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio…

A: In this question we have to find the age of the rock in years. Please give positive feedback if the…

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.