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Main Sequence Stars

This job compares the main sequence life spans of low mass stars and high mass stars. It also explains why they are so different.

Sun and Stars Compared

Compare the Sun with two other stars. Create a table comparing luminosity, distance from Earth, temperature, and mass. Based on this information state whether you think the comparison star is older, younger, or about the same ages as the Sun.

weight on the surface of a neutron star

Neutron stars, such as the one at the center of the Crab Nebula, have about the same mass as our sun but a much smaller diameter. If you weigh 655 N on the earth, what would you weigh when at the surface of a neutron star that has the same mass as our sun and a diameter of 16.0 km? Take the gravitational constant to be G =

Calculate energy and sketch spectrum

At the surface of a distant star, the temperature is approximately 6500 K. a) How much energy is contained in the electromagnetic radiation filling a cubic meter of space at the star's surface? b) Sketch the spectrum of this radiation as a function of photon energy. Mark the region of the spectrum that corresponds to vi

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

Heliocentric Model in the 1600s

Why do you think it was so difficult for people to accept the heliocentric model in the 1600s? And what do you think was the impact of this model, once it was accepted?

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?

Time journey to Earth in a Spacecraft

A spacecraft, traveling at a typical attainable speed of about 25,000 kilometers per hour, leaves Earth and travels toward the closest star system to Earth, the Alpha Centauri system. The time for journey would be about how many years?

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?

Declination and Right Ascension

I'm stuck on this multiple choice question: Which of the following could be the equitorial co-ordinates of a star that rises to the south of east when viewed from 48 degrees north latitude, and 88 degrees west longitude? a declination 60, right ascension 13 hours b declination 30, right ascension 6 hours c declination -3

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