Test 2 Flashcards
A ____ object emits light of all different wavelengths, but
some more than others.
Dense
___ and ____ spread
light out into its different wavelengths
Prism, diffraction gratings
1 of 3 Kirchoff’s Laws
Hot dense material
(Solid, dense gas)
Continuous
1 of 3 Kirchoff’s Laws
Hot diffuse gas
Emission Line
1 of 3 Kirchoff’s Laws
Cooler diffuse gas in front of hot dense material
Absorption Line
Dense =
Continuos
Diffuse (low density) =
Line
Different chemical elements have ____ patterns of lines
Different
The ___ of lines is the fingerprint.
Pattern
Spectrum Lines shine
Emission
Spectrum lines absorb
Absorption
What is the point of a telescope?
- see far away/fine details (angular resolution)
- see light (more light)
- Other wavelengths
True or false: Magnification is relevant.
False; Magnification is irrelevant
What matters when it comes to telescopes?
— Light received
— Details
Do telescopes stick out of domes?
No they don’t
Do we look through astronomy telescopes?
No we use sophisticated detectors to record images
Telescopes are like ____.
The wider the telescope, the ____ light it can collect
— light buckets
— more
Sharpness of images
Angular resolution
What wavelengths make it to the ground?
Visible and radio
Amount of Doppler shift depends on
Speed
Moving towards us
Shorter wavelength
Blueshifted
Moving away from us
Longer wavelength
Redshifted
Most important greenhouse gases
— water vapor
— CO2
— Methane
A greenhouse gas is a gas that does let____ through, but does not let _____ through.
- Visible light
- Infrared light
What makes up the Earth’s atmosphere
— 77% N gas
— 21% Oxygen gas
—- 2% everything else
Jupiter number of moons
95
Uranus number of moons
28
Saturn number of moons
146
Neptune number of moons
16
Elliptical orbit, strength of tidal forces constantly changes its shape
Tidal heating
Io ( jupiters moon) is surprising because
Volcanos but small
Europa ( Jupiter moon)
Tectonic activity
Thick H20 layer
Enceladus (Saturn moon)
Icy moon
Tectonic activity
What can drive lunar geological activity
— Tidal heating
— composition
Dectecting exoplanets: 3 techniques
Transit
Direct imaging
Doppler (radial velocity)
Direct imaging
Bright planet
Far from star
Transit
Planet passes in front of of sat and blocks light
Close to sun
Perfectly aligned orbit
Most exoplanets found this way
Doppler ( radial velocity)
Large force
Half orbit at least
Moving towards/awY
Measured by Doppler shift
Nearest exoplanet
Proxima Centauri
