Download REVIEW: STAR`S TEST

REVIEW: STAR’S TEST 2014-15
What force causes particles of stellar dust to become attracted to each other ? _GRAVITY__
The most widely held astronomical theory about the origin of the universe is the BIG BANG theory.
The fact that the spectra of stars are shifted towards the red suggests that the stars are moving _AWAY____
Diagram the correct sequence of a star’s life cycle.
Write the formula for a fusion reaction. H + H
He + STUFF
What do each of the letters stand for in the formula E=mc2 . E= ENERGY M= MATTER C = SPEED OF LIGHT
Explain how the e and m are related. A small amount of ___MATTER__ can become a huge amount of __ENERGY_
What is the speed of light ? 186,000 MILES/SECOND
What is the EMS and what are at its extremes ? RADIO WAVES
GAMMA WAVES
What are the relative wavelengths of those extremes ? RADIO WAVES = LONG & LOW ENERGY GAMMA WAVES = SHORT &
HIGH ENERGY
List the visible light from longest to shortest wavelengths. Red Orange Yellow Green Blue Indigo Violet
What happens to white light as it passes through a prism ? REFRACTS
Which color refracts the most and least ? RED
What is thought to be at the center of all galaxies ? ____BLACK HOLE______
What is the name of our galaxy ? ____MILKY WAY______
The planets that are closer to the sun have a
FASTER_
orbital speed.
The stars that are closer to the center of a galaxy have a SLOWER
orbital speed than those further out.
Approximately 90% of the visible universe’s mass is composed of ___HYDROGEN____
We can “see” about 10 % of the stuff that the universe is composed of.
In the H-R diagram, stars are classified on the basis of
MAGNITUDE (LUMINOSITY)/SIZE
and __TEMPERATURE/COLOR___
A cloud of gas and dust in which a star is born is called a ____NEBULA_______
On the H-R Diagram which group do most stars fall? ___MAIN SEQUENCE____
The actual brightness of a star is its
Blue stars are
ABSOLUTE (LUMINOSITY)
BIGGER, BRIGHTER, HOTTER
magnitude.
than red stars.
What factor determines a star’s color ? ______TEMPERATURE__
The apparent magnitude of a star tells you how bright the star is as viewed from
EARTH
.
How was Dark Matter discovered ? STARS AT THE OUTER LIMITS OF GALAXIES REVOLVED FASTER
What did Edwin Hubble discover ? GALAXIES RED SHIFTING
A nebula is a huge cloud of gas, primarily composed of HYDROGEN .
A nebula becomes a star when _____FUSION TAKES PLACE IN ITS CORE______
Our sun is what color ? ______YELLOW___________
Using the H-R Diagram below, answer the following questions:
White dwarfs have HIGH temperature and
Supergiants have LOW
temperature and
A star with an absolute magnitude of -6 is
LOW
absolute magnitudes
HIGH
absolute magnitudes
_BRIGHTER than a star with an absolute magnitude of +2.
Answer the next questions using the following charts:
What is the apparent magnitude of the sun ? ____-26.5_________
What is the apparent magnitude of Jupiter ? _____-2.0_______________
How much brighter is the moon than Jupiter ? ____10,000_____________
Can a 15 cm telescope see an object with an apparent magnitude of 18.5 ? _______NO____________
The top of the diagram shown below shows the spectrum of 4 elements. Use this diagram to determine which
elements are in the star shown in the bottom of the diagram diagram.
MERCURY, HELIUM, HYDROGEN
Constellations that can only be seen during certain times of the year are called SEASONAL
Constellations that can be seen throughout the year are called
CIRCUMPOLAR
.
.
Using the Star Chart, answer the following questions:
Is Ursa Major a seasonal or circumpolar constellation ? CIRCUMPOLAR
If you wanted to see Orion in the winter, what part of the sky would you look at ? OVERHEAD/SOUTH
Name a star in the constellation Canis. SIRIUS
Is Canis a seasonal or circumpolar constellation ? SEASONAL
What is the name of our north star ?
POLARIS Describe its motions throughout the night. STATIONARY
How can Polaris tell you what line of latitude you are on ? NUMBER OF DEGREES ABOVE HORIZON IS THE DEGREES NORTH
LATITUDE OF THE EQUATOR