What is the size of an object located at a distance 10 km if it has an angular size A of 2 degrees.

What is the size of an object located at a distance10 km if it has an angular size A of 2 degrees. and Use hubbles law to determine the distance to a galaxy cluster in megaparsecs with a rescession velocity of 14,200 km/sec.

Kepler's Third Law / Sunlight to Pluto

I need written out steps and final answer. These 2 questions are giving me a headache. I've been working on them for 2 days and I still can't figure it out. My teacher cannot break it down enough for me to understand. 1. Use the modified form of Kepler's third law to calculate Pluto's mass from the orbital data for Charon (average radius = 19,600 kilometers, 6.4 days to complete a trip around the planet). Be sure to convert the orbital period to seconds and the orbital radius to meters before putting those numbers into the formula. (Assume that Charron's mass is negligible compared to Pluto's). 2. How long does it take sunlight to reach Pluto? thank you!

Moving from the geocentric model to the heliocentric model required more than one major change in outlook.

Moving from the geocentric model to the heliocentric model required more than one major change in outlook. Among those changes, people needed to accept that the Earth is not the center of the Universe. Discuss how great a change this made in our understanding of our place in the universe.

Astronomy is the most ancient science.

Astronomy is the most ancient science. Discuss how the development of astronomy is interrelated with the development of civilization. Some possible relationships include astrology, the names of constellations, calendars, and the basic ideas of mankind’s place in the universe.

Discuss the various reasons people have thought the Earth was round, going back to ancient times. Discuss why you think this idea was not well known.

Discuss the various reasons people have thought the Earth was round, going back to ancient times. Discuss why you think this idea was not well known.