Why do we believe there is dark matter? b) What important discoveries were made early in the 20th century by using RR Lyrae variables
Q: If p = 2.7 x 10-27 kgm-3, what is the radius of curvature Ro of Einstein's static universe? How long…
A: Given: Density,ρ=2.7×10-27kg/m3Speed of light,c=3×108m/sEinstein's constant,κ=1.86×10-26m/kg Albert…
Q: You have discovered a galaxies which is extremely red. Based on the redshift of this galaxy, you…
A: This problem is based on the Hubble’s law. According to this law, we have the following expression.…
Q: How long will it take, in years, until today’s Hubble radius has expanded to 9 times its current…
A:
Q: What was the maximum age of the universe predicted by Hubble's first estimate of the Hubble…
A: Hubble’s time: It is defined as follows, Here H is the Hubble’s constant which has unit km/s/Mpc…
Q: What are the possible fates for the universe? What do they depend on? What appears to be the actual…
A: In cosmology, the possible fates of the universe are broadly categorized into several scenarios…
Q: I'm doing a debate about Kalam cosmological. I need to have an example of something out of nothing…
A: Answer:- Atomic physics, Nuclear Physics, Relativistic Physics , Quantum physics, Thermodynamic and…
Q: According to the cosmological principle, our place in the universe does not appear to be…
A: According to the cosmological principle, our place in the universe does not appear to be…
Q: What observation in astronomy, made AFTER the discovery of quasars, was a big help to astronomers in…
A: A quasar is an enormous object same like star. It also shines very brightly. It sends out radio…
Q: How many neutrons are in a 2.8-solar-mass neutron star? Assume the star’s mass is entirely neutrons…
A:
Q: Question A7 Consider the following line element, ds² = - dt² + a² (t) (da² + dy²) + b² (t) dz²,…
A: The objective of the question is to determine whether the given line element obeys the Cosmological…
Q: Consider a universe in which the Hubble constant has been measured to have the value Ho = 50…
A: Given: The measured value of the Hubble constant is H0 = 50 km / s / Mpc
Q: What is the estimated age of the Universe (in years) if the Hubble constant is 70 km/s/Mpc?
A:
Q: Astronomy) Cygnus Loop Velocity. If the Cygnus Loop is 25 pc in diameter and is 10,000 years old,…
A:
Q: What was the maximum age of the universe predicted by Hubble's first estimate of the Hubble…
A: The first estimate for the Hubble constant H was 500 km/s/Mpc. The formula for the age of the…
Q: 3C 273 was the first quasar identified (1963). When we look at its chemical spectrum, we see that…
A: Given:- λobs = 759 nm.λ0 = 656 nm
Q: The hypervelocity star S5HVS1 has a redshifted Hβ line (rest wavelength of 486.135 nm) observed at…
A:
Q: According to the version of the Big Bang Theory without a Cosmological Constant (and without Dark…
A: Hubble's Law states that as the universe is expanding in all directions, the receding velocity of an…
Q: Does observed gravitational lensing correspond to a converging or diverging lens? Explain briefly.
A: Gravitational lensing: In this effect, the light rays bend towards massive objects in the space due…
Q: Which of the following is least reasonable regarding cosmic background radiation (CBR)? Group of…
A: (a) CBR corresponds to a solar temperature of about 6,000 degrees and implies that the Universe was…
Q: Why can't we see past the cosmological horizon? O The universe extends only to this horizon. O…
A: We can't see past the cosmological horizon because the only things that we saw on the night sky is…
Q: What do you expect the temperature of the CMB to be when the Universe has expanded to 4.70 times its…
A: Required : Temperature of the CMB if the universe has expanded 4.7 times times its current size.
Q: If you find that the Hubble constant is double what we currently believe, how does this affect the…
A: Q) If you find that the Hubble constant is double what we currently believe, how does this affect…
Q: What is “dark energy”? What is “dark matter”? Why do some scientists think it is everywhere, while…
A: We live in a universe where a lot of space seems to have nothing but a vacuum. A majority portion of…
Q: What is the point of view on the topic of parallel universes and black holes? Using a predominant…
A: The exploration of parallel universes and black holes has captivated the human imagination for…
Q: One of our closest stars is our Sun, duh. If the distance from Earth to our Sun is 1.56e-05…
A: Solution: The speed of the star is obtained by the Hubble relation, v=H0d…
Q: An object is measured to be at a distance of 20 Megaparsecs away from Earth. Using a currently…
A: According to the Hubble's law, galaxies are moving away from Earth at speeds proportional to their…
a) Why do we believe there is dark matter? b) What important discoveries were made
early in the 20th century by using RR Lyrae variables?
Step by step
Solved in 2 steps
- B6Was the Big Bang an explosion? Explain your answer.Does Hubble's Law work well for galaxies in the Local Group (such as Andromeda)? No, because dark energy is accelerating the universe's expansion over those distances. No, because we do not know the precise value of Ho. No, because Hubble did not know the Local Group existed when he discovered his law. Yes, it works well for all galaxies. No, because galaxies in the Local Group are bound gravitationally together.
- With the aid of a diagram, explain the physical origin of cosmological redshift in an expanding universe, and how this differs from the Doppler shift due to relative motion. Observations of distantgalaxies indicate that their recession velocities, v, and their distances, d, follow a Hubble Law:v = H0d, where H0 is a constant. Using the analogy of an expanding grid or ruler, demonstratethat Hubble’s Law indicates that the Universe is undergoing uniform expansion.What is the CMB? Group of answer choices A dense region of 4.5 million stars. A large star of 4.5 million solar masses. The cosmic microwave background of photons left over and cooled down from when the universe became transparent 300,000 years after the Big Bang. The space curvature of the universeWhat is the spatial radius of curvature for a hypothetical closed universe at a moment of time with given values below. Give the answer in units of Mpc, to the nearest integer (not in scientific notation - e.g., 1234). Values: H = 51 km s-1 Mpc-1 ρ = 2.9x10-26 kg m-3