Wikibooks: Adventist Youth Honors Answer Book/Nature/Stars (South Pacific Division)

• Format: Book
• Language: English
• Subjects: Pacific; The Pointers
• Online Access: https://en.wikibooks.org/wiki/Adventist_Youth_Honors_Answer_Book/Nature/Stars_(South_Pacific_Division)

honor header 1 2001 Nature South Pacific Division AY Master Naturalist =1= =a) Name the closest star beyond the solar system.= Alpha Centuri the brightest of the Pointers in the Southern Cross. This star is actually comprised of three stars. Two are bright blue stars that move around each other. The third is a red dwarf that revolves around the other two. The red stars name is Proxima Centuri and at present is the closest. =b) Compare the distance from the earth of this star with the distance of the moon to the earth.= Closest Star 4.243 light years Moon 386 000 km =c) What governs the tide?= The tides are governed by the Moon and to a lesser extent by the Sun. Spring tides are when the pull of the moon and sun is greatest and neap tides is when the pull is least. =d) What causes an eclipse?= An eclipse is caused when the Sun Earth and Moon are in a direct line with one another. When the Earth is between the Sun and the Moon we see a lunar eclipse which is the Earth s shadow falling on the moon. When the Moon is between the Sun and the Earth we see a solar eclipse which is when the Moon s shadow falls on the Earth (blocking the Sun). =e) What is a shooting star?= A shooting star is not a star at all but rather a meteor. A meteor is any celestial body (usually quite small) that falls to the Earth. Most burn up in the atmosphere before reaching the surface leaving a bright short lived streak in the sky. A meteorite is the fragment that reaches earths surface sometimes creating a crater. =f) How fast does light travel?= 300 000 km per second. So the distance in a year is called a light year. =2= = Make a diagram showing relative positions and movements of the earth sun and moon. Show positions and movements for eclipses of the sun and moon.= One may demonstrate by using an orange walnut and marble or similar objects to show positions and movements of the earth sun and moon when there is an eclipse of the sun and when there is an eclipse of the moon. Then draw simplw diagrammes. Place the sun model in the center. ...