The Moon has now completed half of its revolution around Earth. Before moving Earth into the next position place the Moon in the right hand. Now Earth should move the right arm into a position straight out to the side. Once again only half of the Moon is lit. Have the students carefully note which half is lit. This is the phase known as a third-quarter Moon.
The Moon has now completed three-quarters of its revolution around Earth. This "face" appears approximately three weeks after a new Moon. To complete the demonstration, have Earth once again face the Sun. The Moon should be held straight out in front of Earth, again showing the darkened side facing Earth. The lunar cycle now starts over again. The demonstration has concluded. A waxing crescent will occur between a new Moon and a first-quarter Moon.
A waxing gibbous occurs between the first-quarter Moon and full Moon. A waning gibbous occurs between a full Moon and a third-quarter Moon. A waning crescent appears between a third-quarter Moon and a new Moon. Category: Space Published: August 6, The moon is actually quite dim, compared to other astronomical bodies. The moon only seems bright in the night sky because it is so close to the earth and because the trees, houses, and fields around you are so dark at night.
In fact, the moon is one of the least reflective objects in the solar system. Both the earth and the moon are illuminated by the same amount of sunlight coming from the same angle in this photo. As you can see in this photo, the earth is much brighter than the moon.
In general, we can see objects because they direct light into our eyes or into cameras which record information that is later used by display screens to direct light into our eyes. There are two main ways that an object can direct light into our eyes. Either the object creates new light or it reflects light that already existed. Objects that create light tend to also reflect ambient light, so that they tend to be the brightest objects around.
Examples include campfires, light bulbs, candle flames, and computer screens. In terms of astronomical bodies, stars are the main objects that create significant amounts of visible light, and therefore are some of the brightest objects in the universe.
If a planet somehow became large enough to initiate nuclear fusion and begin glowing, it would no longer be a planet. It would be a star. Since planets and moons do not emit light, the only reason we can see them is because they reflect light from some other source. The strongest source of light in our solar system is the sun, so usually we see planets and moons because they are reflecting sunlight. The amount of sunlight incident on a moon or planet that gets reflected depends on the materials in its surface and atmosphere as well as its surface roughness.
Snow, rough ice, and clouds are highly reflective. Most types of rock are not. It appears larger and brighter and we can usually see the man-in-the-moon face really clearly. As the orbit changes, the angle of the light changes and less and less light bounces back to earth. Due to the elliptical orbit, the moon occasionally gets even closer. The light of a super moon is so bright, that astronomers have to put away their telescopes because the light hides a lot of the surrounding night sky, including the light of smaller stars.
The moon is made up of volcanic rock that is 4. This has caused the moon to have a lot of craters and mountains. As the angle changes in the orbit of the moon the angle of the mountains and craters also changes and the light that is reflected from them becomes dimmer.
0コメント