So if our universe is about 15 billion years old. Do we think this because we can't see farther away in the distance or is there no light source past that distance?

Q: As the Universe becomes older, what effect will that have on a slope of the Hubble's diagram: It…

A: Doppler effect in light is the change in frequency of light observed by the observer when the source…

Q: What are the three important pieces of evidence that led scientists to accept the Big Bang as the…

A: The Big Bang model is one of the many theories that were developed to explain the birth of the…

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

A:

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 is the only thing that remains constant all over the universe

A: A constant is a quantity that is conserved with time. And and Invariant quantity is something that…

Q: is "the idea that a complete description of the universe at any time-fifty years ago, shortly after…

A: Step 1: The answer is: Determinism Step 2: Explanation: In physics, determinism means that the state…

Q: Is the universe open or closed?

A: the universe as "closed," "open," or "flat," meant that the density of the universe was either so…

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: TRUE OR FALSE: Einstein correctly predicted that the universe is both infinite in size and static in…

A: Given: Einstein correctly predicted that the universe is both infinite in size and static in motion.

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: 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: Why the gravitational force is so important on the cosmic scale?

A:

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: why is it reasonable to suspect that travel between stars is nearly impossible?

A: Somethings are impossible because they violate fundamental laws of nature. Today, we belive that…

Q: Why do we think that nothing, other than light, can travel faster than the speed of light?

A: According to the Einstein’s theory of relativity nothing can travel faster than light.

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: With the aid of one or more diagram, explain how observations of the CMB can be used to determine…

A: In a flat or zero curvature universe, Euclidean geometry applies at the very largest scales. This…

Q: Does it make sense to ask, “If the universe is expanding, what is it expanding into?”

A: To explain the correct answer for the given question is as follows,

Q: Light travels a certain distance in, say, 20,000 years. How is it possible that an astronaut,…

A: Light travels a specific distance in 20,000 years with respect to the observer’s frame of reference.…

Q: longer than the length of r

A: given, Length of the recorded history = 1011 s Age of the universe = 1018s let length of the…