do not generate their own light. Seen by reflective light.
generate their own light (energy) from fusion reaction occurring within their mass
a huge group of single stars, star systems, star clusters, dust and gases bound together by gravity
stars give off energy in what form?
convex lens bends light to an eye piece
concave mirrored lens reflect light to an eye piece
building that contains one or more telescopes
the scattering of human made light that obscures our view of the sky and so hinders astronomical observations
charcteristics of stars
color, temperature, chemical composition, brightness, size
An instrument astronomers use to break a star's light into a spectrum or band of colors. Gives astronomers information about the compostion and temperature of a star
brightness a star would have if it were a standard distance from earth
measurement of distance light travels in a year. 9.5 million km
speed of light per second
used to measure distance to nearby stars
A graph relating the temperature and brightness of stars.
patterns in H-R diagram
white dwarf, main sequence, giants, super giants
the life of a star relies on ___________________
1st step of star growth... large cloud of dust and gas. gravity pulls together
2nd step of star growth....nuclear fusion starts
high or medium mass star formed
3rd step in star growth
grow to red giant or supergiant
4th step in star growth
a group of 2+ stars
2 stars orbiting one another
bulge in middle w/ arms that spiral outward. new stars form in arms.
look like a round or flattened ball.- billlions of stars, old stars, little gas or dust
do not have a regular shape. smaller than other types of galaxies
Our Solar System is located in what galaxy?
what kind of galaxy is Milky Way?
Big Bang Theory
all matter confined in a very small area, then exploded to form universe in an instant
The diameter of the Milky Way
100,000 light years