the brightest star in the constellation Leo
Regulus
part of the sun visible only during a solar eclipse
chromosphere or corona
The ______________ is the imaginary line that stretches from pole to pole.
axis of rotation
A high-speed stream of particles that travels outward from holes in the sun's corona and beats upon the earth's upper atmosphere
solar wind
dark patches on the sun's photosphere are
sunspots
large clouds of gas and dust floating around in space
nebulae
The __________ is the part of the sun's atmosphere closest to its surface
chromosphere
the force that resists motion
friction
The study of outer space and all that it contains is called
astronomy
The cluster with about 40 galaxies in which we find earth is called the ____________.
Local Group
the hottest region of the sun
core
the brightest star in the sky
Sirius
A __________ is a pair of stars that travel together and rotate around each other as the moon of the earth.
binary star
three basic types of galaxy shapes are
spiral, elliptical, irregular
familiar shape within the constellation Ursa Major which contains the pointer star
Big Dipper
A ______ is the actual explosion of a star.
supernova
an area that contains no air
vacuum
the closest star to the earth
the sun
The __________ is the hottest region of the sun's atmosphere.
corona
The sun is located __________ miles away from the earth.
93 million
the brightest star in the constellation Perseus
Algol
name the constellation
Southern Cross
spiral arms attached to a straight "bar" that runs through a galaxy
barred spirals
the pole star is known as the _______
Polaris
streams of gas erupting from the chromosphere and returning in looplike fashion
solar prominence
stars that outline a picture in the sky
constellation
A _________ is a star system containing millions to billions of stars.
galaxy