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AST-101
Astronomy
Answer | |
---|---|
What is the largest moon in our solar system? | Ganymede |
Which moon has the most geological activity? | Io |
What is responsible for the tremendous volcanic activity on Io? | Tribal Heating |
What is the jovian moon with the thickest atmosphere? | Titan |
Saturn's rings are composed of... | Tons of individual particles of ice and rock |
Why can we see Saturn's rings? | Light from the sun is reflected and scattered off the particles in the rings. |
Do all of Saturn's rings orbit at the same rate? | NO, particles in the inner rings orbit faster than particle in the outer rings |
The tail of a comet is formed by... | Interactions with light and solar wind |
Coma | Bright spherical part of a comet observed when close to the sun. |
Plasma Tail | Stretches directly away from the sun. |
Frozen portion of a comet | Nucleus. |
Smallest Doppler Shift is equal to... | Weakest gravitational force. |
Astrometric technique measures | Positions of a star in the sky. |
Transit technique measures | Slight, periodic, dimming of a star (Best for finding Earth sized planets soon). |
Discovering planets through the Doppler technique requires.. | obtaining and studying many spectra from the same star |
The keepler Mission | Currently searching for planet transits around some 100,000 stars |
GAIA Astronomy Mission | Being designed to measure small changes in stellar positions. May help us find many extrasolar planets |
If the Sun was the size if a grapefruit Earth is... | The size of a pin top 15m away |
If the Sun is the size of a grapefruit Pluto is... | 1 mile away |
1Ly = ? AU | 1Ly=9.46x10^12km 1AU=1.49x10^8Km ................. 9.46x10^12/1.49x10^8 = 6.35x10^4 AU/Ly |
Force of Gravity for Earth = ? | Fg=G Ma1*M2/r^2 ................ (6.67x10^-11)(5.97x1024)(100kg) / 6378000(turned into m)^2 ANSWER: 979m/kg*s^2 |