Let's go through the steps to solve this exercise based on the image and the lab manual instructions:

Given:

1. The field of view (view of the sky) is 20,000 km across (diameter).
2. You need to determine the radius of the home planet and calculate how long it would take light to travel across that radius.

Step 1: Calculate the Radius

The radius of a circle is half of its diameter. Since the diameter is given as 20,000 km, the radius $r$ of your home planet is:

$r = \frac{20,000}{2} = 10,000 \, \text{km}$

Step 2: Time for Light to Travel the Radius

Next, you need to calculate how long light would take to travel the radius of the planet. The formula for time $t$ is:

$t = \frac{d}{v}$

Where:

• $d$ is the distance (the radius of the planet) in kilometers,
• $v$ is the speed of light, approximately $3.00 \times 10^5$ km/s.

So, the time for light to travel this distance is:

$t = \frac{10,000}{3.00 \times 10^5} \, \text{seconds}$

Simplifying:

$t = \frac{10,000}{300,000} = 0.0333 \, \text{seconds}$

Final Answer:

• The radius of your home planet is 10,000 km.
• It would take light approximately 0.0333 seconds to travel this distance.

Would you like further clarification on any part of this problem? Here are some related questions you might find useful:

1. How would the light travel time change if the radius were doubled?
2. What is the approximate time light takes to travel around Earth's circumference?
3. How is the speed of light used in astronomical distance measurements?
4. How does the field of view relate to astronomical objects' sizes?
5. How is light travel time used to understand distances in the universe?

Tip:

Remember that time calculations for light travel are crucial in astronomy to measure distances like those between stars and galaxies!