15-30 Test #1
Terms
undefined, object
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- electromagnetic radiation
- Light
- electromagnetic specturm and its parts
- radio, infrared, visible, ultraviolet, x-ray, gamma ray
- electrons, protons, and neutrons
- Parts of an atom
- emmision specturm
- gives off light occurs at the same frequency
- absorption spectrum
- absorbs light
- blackbody radiation
- absorbs all frequencies of light
- Room temperature in Kelvin
- 300K
- Doppler effect
- the frequency of light can be shifted if the source is moving toward(Blue) or away(Red) from us
- Hubble's Law
- Farther away a galaxy is the faster it is moving away from us
- THe steady State Model
- THe model befor the Big Bang Model (thought the universe was in a steady state)
- Big Bang
- the beginning of the expansion of space
- Cosmic Microwave Background
- Microwaves who have traveled millions of years ago
- Cosmological constant or dark energy
- expansion of the universe is excelling!(getting faster)
- What observations is Galileo famous for?
- 4 moons of jupiter, sunspots, phases of venus, mountain on the moons
- What is Tycho Brahe famous for?
- detailed measurements of stars and planets with out a telescope
- What is Johnnes Depler famous for?
- 3 laws of motion
- what is issac newton famous for (the 3 reasons we discussed in class)
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1.developed laws of motion and gravity
2.reflection telescope
3.descovered spectrum of light - why were newtons laws of motion and law of gravity so important to astronomers?
- measure the solar system(mass of everything)
- what did edmund halley observe
- halley's comet
- what are cassini and huygens (the astronomers) famous for
- observaions of saturns rings and moons
- what is herschel famous for
- discovered uranus, bionary stars, 1st to map our galaxy(milky way)
- was is bessel famous for
- 1st measured distance from a star
- What is the relation between the frequency of light and its energy
- high frequency > higher the energy
- how or why is a spectral emission or absorption line made?
- "Steps"
- what do astronomers learn from emission or absorption spectra?
- elements
- what do astronomers learn from a blackbody spectrum
- temp of object
- what does it mean for an object to have a red or a blue shifted spectrum
- away(Red) toward(Blue)
- What was different about the discovery of neptune, and who discovered it?
- Uranus had something disturbing its rotaion,adams, leber
- What was slipher famous for
- Most galaxies have a red shift
- What was edwin hubble famous for?
- law, farther the faster, measuring distance ot another galaxy
- since all galaxies are moving away from us, are wwe at the center of the universe?Explain
- No. all points are moving away from each other
- what are the four reasons why we believe the big bang model
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1. red shift
2. cosmic micro
3. Neucleosynthesis
4. large scale structure - what is the current temperature of the universe, and how is it measured
- 13.7 by ?
- what happened during the period of nucleosynthesis during the big bang
- it is cool enought for nuclei to stay bound together
- what was the universe made of 15 minutes after the big bang
- protons and neutrons
- why is our sun not a first generation star
- stars were bigger, and made of different things
- when was the big bang
- 13.7 billion years ago
- what is the difference between the radiation dominance era and the matter dominance era of the universe
- more energy is in matter than radiation (universe is matter dominated)
- when was the cosmic microwave background made?
- 379,000 my
- when did the first stars form, and what was special about them
- 300 million years, 100-1000 times our sun
- what will happen to the universe in the future
- the sun toasts the earth, the universe is very hot