About what percentage of the universe is believed to be composed of normal matter? O 5% O > 22% O 70% O 19%

Q: The cosmic microwave background consists of: huge clouds of dark matter interspersed with equally…

A: Cosmic microwave background also known relic radiation. Cosmic microwave background is kind of…

Q: Olbers's paradox is solved in part by the fact that the universe is neither infinitely large nor…

A: Olber's paradox is solved by fact that universe is expanding.

Q: Complete the following nuclear reactions and identify the cosmic phase (Big Bang Nucleosynthesis,…

A:

Q: Current evidence suggests that the universe is   a. flat, infinite, and neither expanding nor…

A: To determine: The correct option.

Q: Observations of distant galaxies show O they appear older than they really are. the size of the…

A: We are able to observe  because of light reach us from the stars.

Q: What is the densest subsatnce in the universe?

A: At a modest temperature and pressure the most densest element on Earth surface is Osmium.

Q: A sphere of matter and a sphere of antimatter (both at rest) can annihilate releasing 0.6· 1030 MeV…

A: Let mass of each sphere be m the total energy  released when annihilated, E=0.6 x 1030 MeV = 0.6 x…

Q: If our universe is expanding, what are the implications for the separation between two stars within…

A: C. The distance between the two stars is unaffected

Q: What started the clumping of matter in the early universe that eventually became the seeds of…

A: The force that is carried by the field of virtual astronomical particles in the quantum field is…

Q: Which galaxies are moving the fastest away from us?

A: Our nearest galaxy is Milky way.

Q: Now let’s determine when the universe “started its trip”. The distance is 800 Mpc, but first convert…

A:

Q: What was the most startling discovery about the universe that occurred in 1998? O its expansion is…

A:

Q: Dark matter experiments are built underground to avoid detecting which type of particle? Group of…

A: In order to reduce the noise level signals caused by Cosmic Rays at Earth's surface, dark matter…

Q: Which of the following predictions of the Big Bang indicates that the universe now is around 2.73…

A: The cosmic microwave background radiation. As a result of the expansion of the Universe, it was…

Q: Fourteen years ago, a quasar was found to be located 8 billion light years away. If the age of the…

A:

Q: Earth Life Geosphere Atmosphere Quarks Light Elements Heavy Elements Atoms Galaxies Protostars Solar…

A: Step 1 Given that, the following components of the physical world are according to their temporal…

Q: If the Hubble constant equals 70 km/s/Mpc, the age of the universe roughly equals   a. 6 billion…

A: Given:Hubble's constant H=70km/s/MpcTo find:Age of universe=??

Q: Which statement best describes the Big Bang Theory? Galaxies within the universe collided about 13.5…

A:

Q: What are the types of galaxies?

A: Required :   The types of galaxies.

Q: _______ is the hypothetical form of energy that produces a force that opposes gravity and is thought…

A:

Q: Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus…

A: Given information: The number of nuclei in the universe (n) = 1080  The mass fraction of helium…

Q: The universe is filled with thermal radiation, which has a blackbody spectrum at an effective…

A: According to Wein's Displacement Law,The wavelength of the black body radiation with different peak…

Q: Astronomers frequently say that "there are more stars in the universe than there are grains of sand…

A:

Q: What is the estimated age of the Universe (in years) if the Hubble constant is 80 km/s/Mpc?

A: Hubble constant (H) = 80 kms-MpcUsing , 1 Pc = 3.08×1016 m= 80×1000 ms×106×3.08×1016 m = 2.59×10-18…

Q: The Big Bang Theory is not about the bang itself but about what happened afterwards.  Most of what…

A: Required :  True or False

Q: what evidence is there that galaxies collide and merge?

A: The delicate distribution of matter in the galaxies causes the galaxies to collide and is said as…

Q: What does it mean that energy in the universe is “conserved” ?

A: solution is given as

Q: How do we know the whole universe is expanding?

A: Given:-             The expansion of the universe is shows by Hubble by twentieth century was the…

Q: What curvature will the universe have if the matter and energy density of the universe is equal to…

A:

Q: Is the concept of Big Bang already a perfect scientific theory to explain the existence of the…

A: Astronomers use the term "big bang" to describe how the cosmos began. It is the concept that the…

Q: The background radiation has an average temperature of 2.7 K, using Wien’s Law, the current…

A: Given data:     Current temperature, To=2.7k      Wavelength, λo=1mm      Wavelength, λe=51.1μm…