Astronomy: Stars
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Transcript of Astronomy: Stars
Have you ever wonder how many stars are there?
Did you ever try to count them all?
STARSMeasuring the stars, Giants,
Dwarfs and the Main Sequence
1.) ________ is born when an enormous cloud of hydrogen gas collapses until it is hot enough to burn nuclear fuel.
STAR
2.) The group of stars are called ________.
CLUSTERS
3.) It is the rate at which a star radiates energy into space.
Luminosity
4.) It is a graph that plots stars color and its luminosity.
Hertzsprung - Russell
Diagram
5.) How many types are there to classify a star?
7
6.) ________ is an example of a yellow dwarf.
SUN
7.) The composition of stars is studied using _____________ in which their visible light is studied.
SPECTROSCOPY
8.) These are the classification of stars; O, B, A, T, F, G, K, which letter does not belong to the group?
T
9.) Sirius and Vega are examples of a type A star. TRUE or FALSE
TRUE
10.) ___________ is the rate at which a star's radiated energy reaches an observer on Earth.
APPARENT BRIGHTNESS
11.) _____ stars radiate most of their energy in the red and infrared region of the electromagnetic spectrum and thus appear red.
COOL
12.) Hot stars emit mostly _______ and ultra-violet rays.
BLUE
13.) It is the largest known type of star, some are almost as large as our entire solar system.
SUPERGIANT STARS
14.) A rapidly spinning neutron star that emits energy in pulses.
PULSAR
15.) The largest stars have the shortest life span. TRUE or FALSE
TRUE