ASTRONOMY: UNIT 1 REVIEW

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what does the metric prefix MEGA mean?

million

what is the limit of the distance calculation supernovae

millions of l-y

how would you take 0.000234 from standard to scientific notation?

moving the decimal point to the right 4 times (-4) -- 2.34x10^-4

when converting to scientific notation, would moving the decimal to the right make a positive or negative exponent?

negative

what does the metric prefix KILO mean?

thousand

How do you move between the different size units?

- converting from a larger to smaller unit: multiply (km to m -- multiply by 1000 bc there's 1000m in 1km) - smaller to larger: dividing (by factor)

what is the relationship between distance and parallax angle?

- far away: small parallax angle - close in: BIG parallax angle

what are the base units for mass, volume, and temperature?

- mass: grams - volume: liters - temp.: kelvin

what is one thing to remember when converting between the different values for distance?

- smaller to larger unit: multiply - larger to smaller unit: divide

How do you set up Hubble's law to calculate the age of the universe?

1. Hubble formula: d = v/H(low expo)0 2. standard velocity formula: use d = vt to substitute vt = v/H0 3. Solve for t: t = 1/H(low expo)

what are the different units used for distance in astronomy?

1. km - kilometers 2. AU - average distance earth to sun 3. light year - distance light travels in 1 yr 4. parsec - parallax-seconds 5. megaparsec - 1 mil parallax-seconds

what is the correct format of 1600 in scientific notation?

1.6 x 10^3

what does the metric prefix MILLI mean?

1/1000, one thousandth (10^-3)

what is the limit of the distance calculation cepheid variables

10+ thousand l-y

what is the limit of the distance calculation parallax?

1000 l-y

How are Doppler's law and Hubble's law are related?

Doppler gives velocity, which is plugged into Hubble to give us distance

what is the relationship between a galaxy's distance and velocity that was found by Hubble?

Farther away a galaxy is, the faster it is moving

How luminosity can be used to find distance?

Inverse square law - Luminosity fades with distance^2 - Stars of same luminosity, one 4 times farther away will look 1/16 as bright as the closer star

How to use scale and displacement on photos to find parallax angle?

Use the given scale and measure displacement: multiply scale by the measured displacement = the parallax angle

what is the cosmic distance PARALLAX?

apparent change in position of a star caused by a change in position of the earth

How would you take 12.5 from standard to scientific notation?

by moving the decimal point one to the left (1+) -- 1.25x10^1

what id Doppler's law?

change in wavelength (or frequency) caused by the movement of whatever is transmitting the wave

How can you use parallax formula to calculate distance?

d = 1/p

what is the limit of the distance calculation hubble's law

edge of the universe

what is hubble's law?

father away a galaxy is, the faster it's moving

what is the limit of the distance calculation radar/laser?

inner solar system

when converting to scientific notation, would moving the decimal to the left make a positive or negative exponent?

positive


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