Homework Help for Astronomy

This is worksheet 3 from my NAT101 course. i need help with the questions pls 

I need help with the chart from Seneca college, class NAT 101: is there life beyond earth

7) Here is a table with properties of 12 objects that orbit the Sun. Classify them in 3 groups according to the shown properties. Density is related to the types of materials (water has density of 1.0 g/ , rocks - about 3.0 g/ , most metals - more than 5.0 g/).

                          g/                    Earth #1                      (C) 

1	5.4	0.06	-170C to 350C
2	1.3	318	-108C
3	5.3	0.81	470C
4	0.7	95	-180C
5	5.5	1	-90C to 60C
6	4.0	0.11	-140C to 20C
7	1.3	14	-218C
8	1.6	17	-218C
9	1.9	2.2 x	-223C to -233C
10	2.5	2.8 x	-217C to -243C

11	2.1	4.3 x	-100C
12	2.8	3.5 x	-102C

Write just a few sentence that "describe" and " reflect" your experience with nature that makes you happy.

Our Sun is represented by letter _______ and is considered _________.

Stars in a region of A are ________ and are near the _______ of their lifespans.

1. How close is Charon to Pluto’s Roche limit?

How long does it take the sun to convert one earth mass of hydrogen to helium?

What is the round-trip travel time of light from earth to Pluto (at a distance of 40 AU)? How far would a spacecraft moving in a circular orbit 500 km above Pluto's surface travel during that time? To how many orbits does this corresponds?

Many generations of stars have lived and died in the Milky Way. In your own words, describe the three stages in the life cycle of these stars.

Limit your answer to less than 150 words.

Can the motion of a satellite orbiting the earth be described by Kepler’s three laws? Explain why and/or why not?

Limit your answer to less than 150 words.

Explain why a warm gas emits only light at specific wavelengths whereas a light bulb containing a heated wire produces a rainbow of colors.
Limit your answer to less than 150 words.

You look at a far away star in the night sky with a very precise telescope and notice it appears orange in color. What can you deduce about the star’s temperature, motion, and chemical composition?
Limit your answer to less than 150 words.

The Andromeda galaxy lies about 2.5 million light-years away. To what distance do the angular  resolutions of SST (3”), HST (0.05”), and a radio interferometer (0.001”) correspond at that distance?

14. Answer the following question and limit your answer to less than 200 words.

a) Give three ways in which ancient civilizations used the sun to help with daily activities.

b) For each one of the three ways mentioned, use your understanding of modern astronomy to explain whether the ancients were justified or misguided in their use of the sun.