1.our position iin space

2. the earth's movement through space

3. the effect on earth's

(m)

(e)

(s)

(()   (e)   ())

(s)

 the diameter of an opening through which light passes in an optical instrument

a dead star with a maximum possible mass of 1.4 solar masses that has cooled to a point where it no longer glows with residual heat

 the high-temperature outermost atmosphere of the sun, visible from Earth only during a total solar eclipse

a measure of how closely a planet's orbit approximates to a perfect circle

a white dwarf star in a binary system that brightens suddenly by several magnitudes as gas pulled away from its companion star explodes in a thermonuclear reaction

an old star whose outer layers have billowed out and cooled down

the stage in the evolution of a massive star when its core contracts, its surface expands to about 500 solar radii, and its temperature drops, giving the star its red color

an explosion of a massive star at the end of its life; the star may briefly equal an entire galaxy in brightness

a collapsed core of a normal star such as the sun after it has lost its outer layers

the portion of the spectrum with wavelengths just shorter than the bluest light visible

 the outer part of an eclipse shadow; also, the lighter area surrounding the center of a sunspot