The source of the sun's energy is the result of
How long does it take light from the sun to reach the Earth?
The most explosive events to occur on the Sun are ______.
The sun has enough fuel to last how many more years?
5 billion years
Why would the moon make an good site for an observatory?
Which of the following colors has the longest wavelength
Granules are located on this layer
Which part of the electromagnetic spectrum is detected as heat?
In order to have a nuclear fusion produced in the core of the sun there must be
very high pressure and very high temperature
The spectra of most stars are of this type
dark line (absorption) spectrum
The sun produces energy by converting ____________
hydrogen nuclei to helium nuclei
To determine whether a celstrial body is approaching or receding from Earth, astronomers employ _________________
the Doppler principle
The southern lights are known as the
What layer of the Earth's atmosphere that produces auroras?
As an object approaches the Earth the spectra shifts toward the ____ end of the spectra.
How did Galileo prove the sun rotated?
movement of sunspots
Which layer of the sun is visible only during a total solar eclipse?
Auroras are an effect caused by
What fuel is being consumed during nuclear fusion?
We know that the area surrounding a sunspot is hotter than the sunspot
the sunspot is darker than the surrounding area
_________ are great arches of hot gas streaming between sunspots.
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