Chapter 15

Here are the next set of Q&A for Chapter 15 – The Moon. If you notice anything weird, let me know! 🙂

1. Describe the appearance of the Moon through binoculars or a low-power telescope. What are a) the maria, b) the ray system, c) the rills of clefts?
a) Maria are sea like regions on the Moon though there has actually never been any water on the Moon.
b) The ray system is a collection of surface deposition. When meteors collide with the Moon, then some matter was thrown out to the sides and when there is the right amount of light from the Sun, you can see them clearly.
c) The rills are crack like features on the Moon’s surface. They are generally evidence of collapsing land features.

2. a) Describe, with a diagram, the cause of a lunar eclipse.
A lunar eclipse occurs when the Earth moves in front of the Sun, preventing any light reaching the Moon.

2. b) What is the phase of the Moon during a lunar eclipse?

The phase of the Moon at this point would be half moon.

2. c) From any particular point on Earth, why are lunar eclipses more common than eclipses of the Sun?
They are more common because all that is needed is the Earth to be in the way of the Sun, and at the distance and ratio of sizes,the Earth can easily hide the Sun.

3. a) What is Harvest Moon, and when does it occur?
It usually occurs in late September, and a Harvest Moon is when the Moon is at the shallowest angle with the


3. b) Why does the full moon appear higher in the sky at midwinter than in midsummer?
The Moon appears to be higher in the sky during midwinter because the Sun is low in the day and drops even further at night; meaning that the Full Moon does the opposite from that. It rises high above the horizon and low below it.

3. c) What is meant by ‘retardation’?
The time difference between the concessive Moon rises. i.e. It may 5 minutes.

4. a) Why can we on Earth see only part of the total surface of the Moon?
Because the Moon rotates on its axis at the same rate as it orbits Earth, meaning the same face faces Earth all of the time.

4. b) Why has the Moon no atmosphere – What is one simple observational proof this?
The Moon has no atmosphere because it has such a low escape velocity, allowing the atoms of the atmosphere to escape. The obvious observational proof is the craters we can see. They are very old, yet the craters the same age on Earth are nearly gone. That is from weathering and erosion, which the Moon cannot have because of its lack of atmosphere.

4. c) Why is the lunar sky always black?
As there is no atmosphere on the Moon, there is nothing that can defract, refract of reflect the light. This means it is constantly black.

5. a) Who were the first men to land on the Moon, and what did they see?
The first men to land on the Moon were Neil Armstrong and Buzz Aldrin. The experienced a strange setting. Hills and pits everywhere and no noise, no movement and they seemed to move in slow motion.

5. b) Describe the constitution of the Moon (use a diagram if necessary).

5. c) Outline the main advances in our knowledge of the Moon obtained by the manned and unmanned probes.
We have learned more about composition of the Moon itself, including the types of rocks found on the Moon’s surface. And we have more understanding about the way the Moon was formed and why it looks the way it does.

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