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the moon has no air on it | 1 |
mars is a kind of planet | 1 |
moons orbit planets | 1 |
phobos orbits mars | 1 |
light reflecting off of an object causes that object to be visible to the observer | 1 |
the moon reflects sunlight towards the earth | 1 |
a moon is a kind of celestial object / celestial body | 1 |
a dwarf planet usually is much smaller in size / in mass than other planets | 1 |
as the mass of a celestial object decreases , the surface gravity of that celestial object weakens | 1 |
pluto is a kind of dwarf planet | 1 |
a dwarf planet is a kind of celestial object | 1 |
our sun is located at the center of our solar system | 1 |
our solar system is located at the edge of the milky way galaxy | 1 |
the sun is the star that is closest to earth | 1 |
a star is a kind of celestial object / celestial body | 1 |
a star produces light and heat | 1 |
a star produces light and heat | 1 |
a candle is a source of light when it is burned | 1 |
a source of something emits / produces / generates / provides that something | 1 |
plasma is formed by electrons separating from atoms in stars | 1 |
electrons are pulled away from atoms in a star by high temeprature | 1 |
plasma is a kind of state of matter | 1 |
the sun is located near the edge of the milky way galaxy | 1 |
average is similar to medium | 1 |
the sun is average in size for a star in our galaxy | 1 |
a star is a kind of celestial object / celestial body | 1 |
a source of something emits / produces / generates / provides that something | 1 |
astronomical is similar to celestial | 1 |
a star is a source of light / light energy through nuclear reactions | 1 |
the formation of something is a kind of process | 1 |
nuclear fusion causes star formation | 1 |
if something causes a process then that something is required for that process | 1 |
if something requires something else then that something else is important to that something | 1 |
the sun is a kind of yellow dwarf | 1 |
alpha mensae is a kind of main sequence star | 1 |
a yellow dwarf is a kind of main sequence star | 1 |
a yellow dwarf is a kind of main-sequence star | 1 |
the sun is a kind of yellow dwarf | 1 |
red giant stars are greater in volume than main sequence stars | 1 |
stars are mostly made of hydrogen and helium | 1 |
stars generally have the same chemical composition | 1 |
the sun is a kind of star | 1 |
hydrogen is the most common element in stars | 1 |
nuclear fusion is a kind of process | 1 |
nuclear fusion in a star 's core generates energy for stars to burn / shine | 1 |
the sun is a kind of star | 1 |
stars change type during their life cycles | 1 |
classifying is when one sorts something by kind / type | 1 |
stars can be classified by temperature, color, and brightness | 1 |
nuclear fusion in a star 's core generates energy for stars to burn / shine | 1 |
nuclear fusion converts hydrogen into helium | 1 |
the sun is a kind of star | 1 |
the sun is a kind of star | 1 |
the core is a kind of layer of the sun | 1 |
nuclear fusion happens in the core of a star | 1 |
blue stars are the hottest in temperature | 1 |
blue is a kind of color | 1 |
earth is a kind of planet | 1 |
the mass of a planet causes the pull of gravity on that planet | 1 |
a solid object is taken from earth into space | 1 |
the force of gravity is different in space from the force of gravity on earth | 1 |
as the force of gravity changes , the weight of the object will change | 1 |
as the mass of a celestial object decreases , the surface gravity of that celestial object weakens | 1 |
less is the opposite of more | 1 |
a hammer is a kind of object | 1 |
the earth has more mass than the moon | 1 |
as the force of gravity decreases , the weight of the object will decrease | 1 |
a rocket is a kind of object | 1 |
the rocket escapes the gravitational pull of earth | 1 |
as the force of gravity changes , the mass of the object will stay the same | 1 |
if an object escapes the gravitational pull of a planet, then the force of gravity on that object will change | 1 |
earth is a kind of planet | 1 |
as the force of gravity changes , the weight of the object will change | 1 |
earth is a kind of planet | 1 |
mars is a kind of planet | 1 |
as the force of gravity increases , the weight of objects will increase | 1 |
earth is greater in mass than mars | 1 |
as mass of a planet / of a celestial body increases , the force of gravity on that planet will increase | 1 |
as the force of gravity decreases , the weight of the object will decrease | 1 |
mars is a kind of planet | 1 |
the mars rover is a kind of vehicle | 1 |
earth is a kind of planet | 1 |
gravitational force is similar to force of gravity | 1 |
a vehicle is a kind of object | 1 |
earth is greater in mass than mars | 1 |
the gravitational force of a planet does not change the mass of an object on that planet or celestial body | 1 |
as mass of a planet increases , the force of gravity on that planet will increase | 1 |
the gravitational force of a celestial object does not change the mass of an object on that planet or celestial body | 1 |
as the mass of a celestial object decreases , the surface gravity of that celestial object weakens | 1 |
a rocket is a kind of object | 1 |
the earth has more mass than the moon | 1 |
a moon is a kind of celestial object | 1 |
less is the opposite of more | 1 |
earth is a kind of celestial object | 1 |
as the force of gravity decreases , the weight of the object will decrease | 1 |
less is the opposite of more | 1 |
as the force of gravity decreases , the weight of the object will decrease | 1 |
an astronaut is a kind of object | 1 |
as the mass of a celestial object decreases , the surface gravity of that celestial object weakens | 1 |
the earth has more mass than the moon | 1 |