General
Motion
Planets
Objects in the Sky
Stars
100
Study of the structure and evolution of the Universe as a whole
Cosmology
100
earth spinning on its axis
rotation
100
Planet closest to the Sun and has the shortest revolution period
mercury
100
This is where stars are born...
a nebula
100
a celestial body of hot gases that radiates energy derived from solar fusion reactions in the interior
star
200
Distance light travels in one year.
Light Year
200
A natural satellite of a planet. inner planets have few _____ and outer planets have many _____.
moon
200
Also called the red planet and is composed of a lot of iron oxide
mars
200
This is...
/Whirlpool_1024px-An_Oasis_or_a_Secret_Lair-1-59c5d24068e1a20014de2afa.jpg)
a galaxy
200
Occurs in the core of the sun when hydrogen atoms fuse to make helium and enormous amount of energy is released.
solar fusion
300
The spectral lines of a star will appear _____ if the star is moving away from the Earth.
Red shifted
300
A force of attraction between objects that is due to their masses
gravity
300
Largest planet in our solar system and has a giant red spot caused by low pressure storms
Jupiter
300
This is
a Constellation
300
A huge collection of gas, dust, and billions of stars and their solar systems held together by gravity.
galaxy
400
What type of object is believed to be the central source of energy for an active galaxy?
A massive Blackhole
400
Why do the constellations that are visible in the sky at night change with the seasons?
Because the Earth revolves around the Sun.
400
Planet closest to Earth in size
Venus
400
This is
The Milky Way
400
In which stage of a star's evolutionary cycle does it spend the most time
Main Sequence
500
Recent measurements of the variations of the cosmic background radiation suggest that the curvature of The Universe is
Flat
500
From the observation that the same side of the Moon always faces the Earth, one can conclude that
The Moon completes one rotation each time it completes an orbit about the Earth. Rotation rate= Revolution rate
500
Jupiter, Neptune and Uranus are the __________ __________ of the solar system
gas giants
500
This is
aurora, northern lights
500
A continuum of values with no gaps. Used for measuring a phenomenon like the wavelength of light and color.
Spectrum