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a computer is used for communication / finding information | 1 |
getting information sometimes requires observing / observation | 1 |
a telescope is used for observing stars by astronomers | 1 |
a moon is a kind of celestial object / celestial body | 1 |
detailed observation of celestial objects requires a telescope | 1 |
a planet is a kind of celestial object / celestial body | 1 |
a star is a kind of celestial object / celestial body | 1 |
as distance to a city decreases , the amount of light pollution will increase | 1 |
as light pollution increases , seeing the stars will be harder | 1 |
a telescope is used for observing stars | 1 |
making discoveries requires observing | 1 |
a telescope is used for observing the sky by astronomers | 1 |
using a telescope to photograph solar events requires a light filter | 1 |
a solar flare is a kind of solar event | 1 |
a solar prominence is a kind of solar event | 1 |
venus has moon-like phases | 1 |
a telescope is used for observing planets | 1 |
venus is a kind of planet | 1 |
an optical telescope requires visible light for human to use | 1 |
radio telescopes can see through clouds and dust | 1 |
clouds / dusts block visible light | 1 |
detailed observation of celestial objects requires a telescope | 1 |
if something is required for something else then that something allows that something else | 1 |
a planet is a kind of celestial object / celestial body | 1 |
a moon phase occurs 28 days after the last time it occurred | 1 |
a full moon is a kind of phase of the moon | 1 |
1 month is equal to 28-31 days | 1 |
the new moon is when the dark half of the moon faces the earth | 1 |
a new moon is a kind of phase of the moon | 1 |
the new moon is when the lighted half of the moon faces the sun | 1 |
each of the moon 's phases occurs once per month | 1 |
a full moon is a kind of phase of the moon | 1 |
a new moon is a kind of phase of the moon | 1 |
a student cannot observe the moon in the clear night sky on feburary 21 | 1 |
a moon phase occurs 28 days after the last time it occurred | 1 |
the new moon is when the dark half of the moon faces the earth | 1 |
the dark half of the moon is not visible | 1 |
28 days after feburary 21 is march 21 | 1 |
the moon revolving around / orbiting the earth causes the phases of the moon | 1 |
the moon orbiting the earth occurs once per month | 1 |
the earth revolves around the sun | 1 |
a revolution occurs when something revolves around something else | 1 |
gravity causes orbits | 1 |
planets in the solar system orbit the sun | 1 |
gravity causes orbits | 1 |
mars is a kind of planet | 1 |
planets in the solar system orbit the sun | 1 |
mars is located in the solar system | 1 |
gravity causes orbits | 1 |
the earth revolves around the sun | 1 |
the moon orbits the earth | 1 |
gravity causes orbits | 1 |
planets in the solar system orbit the sun | 1 |
planets in the solar system orbit the sun | 1 |
gravity causes orbits | 1 |
planets in the solar system orbit the sun | 1 |
gravity causes orbits | 1 |
gravity causes orbits | 1 |
the moon orbits the earth | 1 |
planets in the solar system orbit the sun | 1 |
gravity causes orbits | 1 |
uranus is located in the solar system | 1 |
gravity causes orbits | 1 |
planets in the solar system orbit the sun | 1 |
uranus is a kind of planet | 1 |
the moon orbiting the earth occurs once per month | 1 |
the moon 's orbit is elliptical | 1 |
planetary orbits are mostly elliptical | 1 |
planets in the solar system orbit the sun | 1 |
a planet is a kind of celestial object / body | 1 |
as distance from an object decreases , that object will appear larger | 1 |
earth is a kind of planet | 1 |
a star is a kind of celestial object / celestial body | 1 |
the sun is the star that is closest to earth | 1 |
dehydrating food is used for preserving food | 1 |
astronauts require preserved food for extended flights | 1 |
a space probe can orbit / land on other planets | 1 |
a space probe is used for collecting / analyzing materials / samples / information | 1 |
the viking i lander was sent to mars and analyze atmospheric gases and soil samples | 1 |
mars is a kind of planet | 1 |
high tide is a stage in the tide cycle process | 1 |
a tide is a kind of natural event | 1 |
low tide is a stage in the tide cycle process | 1 |
the tide cycle occurs regularly twice per day | 1 |
high tide is a stage in the tide cycle process | 1 |
low tide is a stage in the tide cycle process | 1 |
the tide cycle occurs regularly twice per day | 1 |
the tide is when ocean levels periodically rise / fall | 1 |
the gravitational pull of the moon on earth 's oceans causes the tides | 1 |
the tide is when ocean levels periodically rise / fall | 1 |
the gravitational pull of the moon on earth 's oceans causes the tides | 1 |
the moon moves away from earth | 1 |
moving away from the source increases the distance | 1 |
as the gravitational pull of the moon decreases , the height of ocean tides will decrease | 1 |
as the distance from an object increases , the force of gravity on that object will decrease | 1 |
spring tides occur during a full moon | 1 |
spring tide is when the distance between high tide and low tide is the greatest | 1 |
the sun is located directly overhead at noon | 1 |
the sun is a source of light / light energy called sunlight | 1 |
as a source of light moves directly overhead of an object , the size of the shadow of that object will decrease | 1 |