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Science Unit 1

QuestionAnswer
What is the Big Bang Theory? the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded
What evidence supports the theory that the universe is expanding? Doppler Red-Shift
What is Redshift? the wavelength of the light is stretched so the light is seen as 'shifted' towards the red part of the spectrum
Would an observer would see a star as red-shifted or blue-shifted based on the stars motion relative to the observer? the Doppler effect for light is called a 'blue-shift' if the light source is coming toward an observer, and a 'red-shift' if it is moving away.
What is the relationship between frequency and color across the visible spectrum? Inverse relationship
What is humble's law a galaxy's velocity (or as is sometimes plotted, its red-shift) is directly proportional to its distance
what could you interpret information about a star based on it’s absorption spectra? the temperature and density of that element in the star
What are the stages of evolution for a low mass star? Stellar Nebula -> Average Star -> Red Giant -> Planetary Nebula -> White dwarf
What are the stages of evolution for a high mass star? Stellar Nebula -> Massive Star -> Red Supergiant -> Supernova -> Black hole or Neutron Star
What force causes a nebula to condense into a star? Gravity
What is the light year as unit of distance? How fast light can travel in a year
What is the type of reaction at the core of a star that fuels the star? Fusion (combining) of hydrogen into helium
What are the 3 different types of galaxies? elliptical, spiral and irregular
Which variable is on the X-Axis in the HR diagram Temperature
Which variable is on the Y-Axis in the HR diagram Brightness
Created by: Milo_
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