A
The total power output of radiation emitted by a star is called...
Luminosity
the unit of Luminosity is...
Watts
The apparent change in wavelength or frequency of the radiation from a source due to its relative motion away from or toward the observer is called...
Doppler effect
Current estimates of the age of the universe range from ....
13 - 14 billion years
The observed amount of intensity, or the radiant power transmitted normally through a surface per unit of area, of radiation measured on Earth is called...
Radiant flux intensity (F)
An astronomical object which has a known luminosity due to a characteristic quality possessed by that class of object is called...
standard candle
In space, the Doppler effect of light can observed when spectra of distant stars and galaxies are observed. if the object is moving away from the Earth this is known as......
Redshift
Examples of standard candles are...
Cepheid variable stars and Type 1a supernovae
Collating the data and measurements from each method allows astronomers to build up a larger picture of the scale of the universe is called...
cosmic distance ladder
In space, the Doppler effect of light can observed when spectra of distant stars and galaxies are observed. if the object is moving towards the Earth this is known as......
Blueshift
The black body radiation curve for different temperatures peaks at a wavelength which is inversely proportional to the temperature
this is the Law of...
Wien’s displacement law
what is the name of the stars of the Orion Constellation; cooler stars, appear red or yellow ?
Betelguese
The recession speed of galaxies moving away from Earth is proportional to their distance from the Earth. This the law of...
Hubble’s Law
what is the name of the stars of the Orion Constellation; cooler stars, appear white or blue ?
Rigel
A star’s luminosity depends on two factors: ..... and .......
the universe likely began in an extremely hot, dense singular point which subsequently began to expand very quickly. Thisis the theory of...
Big Bang