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One hundred years ago, many scientists believed that the universe was infinite and eternal, with no beginning and no end.
What major factor determines the future of the Universe?
Procedures in the Physical Sciences: Challenges in Measurements (3) specific challenges to making direct measurements in the fields of astronomy
Derive the Gaussian approximation of the binomial distribution.
A sound source sends a sinusoidal sound wave of angular frequency 3000 rad / s and amplitude 12.0 nm through a tube of air.
How can ds = dqr/T (d-bar q(reversible) / T) can be used to determine the entropy increase of a system in an irreversible process. Why does this technique works
We have heard of simple toy models of the Universe that were studied by Einstein, de Sitter, and Friedman
Use the method of truth table expansion to determine whether or not the sentence below is a theorem of quantified logic.
Describe the concept of our past and future light-cone. Explain the meaning of the terms particle horizon distance, event horizon distance and world-line
What does increased atmospheric CO2 have to do with coral reef degradation? What are the gaps in knowledge? Provide scholarly articles for reference.
At the Galaxy's Core. Astronomers have observed a small, massive object at the center of the Milky Way galaxy. A ring of material orbits this massive object
Galaxy A is found to be receding from us with a speed of 0.8c. Galaxy B I found to be receding from us with a speed of 0.4c.
At what will the crab nebula cross the celestial median on March 12 and 13 2005. The right ascension is 05 31 30 and declination is 21 59 00.
Imagine that there is a big hole that tunnels al the way through the center of the earth vertically. If you drop an apple down this hole what would happen?
A singly charged positive ion has a mass of 2.5*10^-26kg. After being accelerated through a potential difference of 250V, the ion enter a magnetic field
Do you think that our galaxy has ever been an active galaxy? Could it have hosted a quasar when it was young?
The Andromeda galaxy, also known as M31, is the nearest spiral galaxy to the Milky Way and the most distant object visible to the naked eye in the night sky
An astronomer observes two galaxies A and B which have redshifts of:
One reading of people is that they always act out of self-interest and for their own advantage, although they sometimes try to disguise their actions
Suppose a blazar at z=1.00 goes through a fluctuation in brightness that lasts one week (168 hours) as seen from Earth.
How do we calculate or determine the distances to stars? What units do we use and what are the limitations (if any) of the method used for such calculations?
Describe what is meant by redshift and how spectroscopic observations of extragalactic objects may be used to deduce their redshifts.
Our sun rotates in a circular orbit about the center of the Milky Way galaxy. The radius of the orbit is 2.2 1020 m, and the angular speed of the sun
The Sun Rotates around the Milky Way Galaxy at a speed of
To gain full marks you must clearly show your working in any calculation and express your answers to an appropriate number of significant figures.