Scientific notation 

Please provide written explanations for all conceptual questions. Could one please show all of their work for any mathematical calculations so I can understand?

1. The diameter of the Sun is 1.4  106 km, and the distance between the sun and the Epsilon Eridani star is 10.47 ly. Calculate how many Suns it would take, laid side by side, to reach the Epsilon Eridani star. Use scientific notation
2. At what distance is an object if its parallax, as measured from either end of a 1000-km baseline, is (a) 1°; (b) 1; (c) 1(5 mars)?
3. On November 1 at 11:00 P.M., you look toward the eastern horizon and see the bright star Mintaka rising. At approximately what time will Mintaka rise one week later, on November 8? Explain the answer.
4. The photograph of the Earth shown below was taken by the crew of the Apollo 8 spacecraft as they orbited the Moon in 1968. A portion of the lunar surface is visible on the right-hand side of the photo. In this photo, the Earth is oriented with its North Pole approximately at the top. When this photo was taken, what was the phase of the Moon as seen from Earth? Explain the answer with a diagram.

5. What is the maximum possible angle of elevation of the Sun above the horizon at the North Pole? Explain