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3.9.1 Telescopes
Telescopes

7
Refracting and reflecting
3.9.2 Classification of Stars
Magnitude

2
Apparent and absolute
Wien's Displacement Law

1
Maximum radiation wavelength
Stars

4
Life and death of stars
Supernovas and Black Holes

2
Massive celestial events
Distances in Space

2
Vast cosmic scales
Stefan's Law

1
Light and temperature relationship
Spectral Classes

1
Stellar classification
3.9.3 Cosmology
Cosmology

1
Cosmological principle
Redshift

1
Wavelength changes in light
Age of the Universe

2
Origins and evolution
Exoplanets

1
Planets orbiting other stars
Spectra

2
Identifying distant elements
Hubble's Constant

1
Measuring the expanding Universe
Quasars

1
Distant radio sources
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