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Stars

Galaxies and Number of Stars in the Universe

See attached file. Distance from sun Number of stars Number of dwarf galaxies Number of large galaxies Number of galaxy group Number of superclusters 1 ly 5 ly 12.5 ly 20 ly 50 ly 250 ly 5,000 ly 50,000 ly 500,000 ly 5,000,000 ly 100 million ly 1 billion ly

Calculating Escape Velocity

Determine the missing values for each different body (1 Newton=0.22 lb, 1 lb =4.54 N). Values should be carried out to 2 decimal places when it is not a whole number. http://hyperphysics.phy-astr.qsu.du/hbase/vesc.html#ves Use the following applet to calculate the escape velocity. Do not use commas when putting numbers into

Black Holes

Questions on the equation used to calculate the Schwarzschild radius of a black hole... See attached

Optics: Resolving Power

1. The telescope on Mount Palomar has a diameter of 200 inches. Suppose a double star were 8.40 light-years away. Under ideal conditions, what must be the minimum separation of the two stars for their images to be resolved using light of wavelength 550 nm? (Unit: m) All answers must have three significant digits unless other

Thermonuclear Fusion on the Sun

If thermonuclear fusion in the Sun were suddenly to stop, what would eventually happen to the overall radius of the Sun? Justify your answer using the ideas of hydrostatic euqillibrium and thermal equillibrium.

Using the Law of Conservation of Momentum

A mortar fires a shell of mass m at speed v0. The shell explodes at the top of its trajectory (shown by a star in the figure) as designed. However, rather than creating a shower of colored flares, it breaks into just two pieces, a smaller piece of mass 1/5 m and a larger piece of mass 4/5 m. Both pieces land at exactly the same

Light years

An astronomical unit of distance is the light-year, which is the distance light travels in one year. Compute this distance in meters. How many meters away is a star at a distance of 4 light-years from the earth?

Calculate mass of 2 stars in a binary star system

Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 359 million km and to take 4.50 earth years to orbit about a point midway between them. What is the mass of each?

Star Measurements

A.) Briefly describe three ways that distances to stars can be measured. b.) Name an object, not man made , that emits light in pulsars similar to those from a pulsar. Any wavelegnth is okay. Could we detect these pulses if they came from Jupiter? From a nearby star? c.) Name a type of expansion (or expanding object) that

Compare the stars found in the galactic disk

Compare the stars found in the galactic disk (where the sun is located), also known as Population I stars, with the stars in the halo of our galaxy, known as Population II stars. **** Minimum 100 words - Cite all sources / urls