Comets!
Presentation
•
Science
•
9th Grade
•
Practice Problem
•
Medium
Standards-aligned
Dave Fuqua
Used 16+ times
FREE Resource
12 Slides • 7 Questions
1
2
3
A comet is a small celestial body made up of Ice, Dust and Gas.
They have a distinct tail that points away from the sun at all times.
Introduction to Comets
4
Nucleus and the coma
A comet hast two main parts
5
Can range from a few meters to tens of kilometers.
The nucleus of a comet is a solid icy core
6
The coma is the gaseous and dusty atmosphere that can extend hundreds of kilomoters.
7
Multiple Choice
A comet is made mostly of
Ice, dust and gas
Hydrogen, Oxygen and Nitrogen
Donner and Blitzen
Iron Oxide, Carbon Dioxide
8
Multiple Choice
What are the two main parts of a comet?
Ice, Dust
Gas, Rocks
Coma, Nucleus
Core, Tail
9
Multiple Choice
The nucleus of a comet is a _______
Dirty rotton scoundral
Solid Icy core
Hydrogen gas hundreds of Kilometers thick
A mix of iron and oxides
10
Comets have been observed in history for 1000's of years.
Some thought of them as omens or celestial messengers.
Comets in History
11
In 1705 Sir Edmund Halley predicted a comet that would return 75 years later and it was named after him.
12
Multiple Choice
Halleys Comet was last seen in 1986. It comes around every 75 years. When will we see it again?
2030
2061
2086
2075
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Comets have highly eliptical orbits that take them closer to the sun then far out to outer reaches of the solar system
Comets and their Orbits
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15
Multiple Choice
A comet has a highly elliptical orbit. It's eccentricity would be closer to 1 or 0?
0
1
Neither
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The closer a comet gets to the sun, the comet starts to "melt" and gets smaller with each orbit. The tail ALWAYS points away from the sun.
Why do comets have tails?
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18
Multiple Choice
Why do comets have two tails?
Because one is dust and one is gas.
Because the Ice reacts to both liquid and gas.
Some have one tail, some have two. Depends on the comet structure.
The sun creates a bigger tail during the daylight.
19
Multiple Choice
A comets tail grows larger the closer it gets to the sun.
True
False
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