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Having low density

Kirchoff's 3 laws of spectral analysis

A hot solid or a hot, dense gas produces a continuous spectrum.
A hot, low-density gas produces an emission-line spectrum.
A continuous spectrum source viewed through a cool, low-density gas produces an absorption-line spectrum.

electromagnetic wave

a wave that doesn't require matter to transfer energy


theory of relativity, e=energy m=mass c=speed of light

red giant star

a large cool star of high luminosity, a large cool star

center of mass

the average position of the various mass elements of a body or system, weighted according to their distances from that center of mass that point in an isolated system that moves with constant velocity according to Newton's first law of motion

SN 1987A

first supernova seen in 1987 first star to be observed before it was a supernova and after. Most of what we know today about SuperNovas came from this. seen in chili by a Canadian

Core-collapse (Type II) Supernova

death of a massive star

Thermonuclear (Type I a) supernova

when a white dwarf accumulates matter from a companion star at a much faster rate and is pushed over the chandrasekhar limit.

James Clerk Maxwel

The scientist who worked out the mathematics of the connections between electricity, magnetism, and light in the 19th century was


s a unit of frequency, equivalent to once cycle per second


When a positron and an electron collide, they produce:

About 1,000,000 years.

Roughly how long does it take for the energy from photons created by hydrogen fusion at the center of the Sun to reach the surface of the Sun?


The second most abundant element in the Sun, by mass, is:

Main sequence, red giant, white dwarf

Which of the following is the correct life sequence for a low-mass star

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