a person who goes into space
The astronauts are spending two weeks in space
earth day
the length of a day on earth; twenty-four hours
An earth day lasts twenty-four hours because that is the time it takes for the earth to complete one spin
float
to move lightly through the air; to not be held down
The bird flies so gracefully that it looks like it is floating
orbit
the path a thing takes around a star, planet, or moon
There are two moons in orbit around Mars
snack
a small amount of food that a person eats between regular meals
The children ate slices of apple and cheese for a snack
space station
a man-made structure that orbits a planet and on which astronauts can live and work
The astronauts will leave for the space station tomorrow
sunrise
morning's first light, when the sun first appears
The sunrise will be a 5:15 tomorrow morning
sunset
day's end, when the sun goes down
The sunset was beautiful yesterday evening
yogurt
a thick milk product that can be eaten plain or with fruit, sugar, etc. added
Some people eat breakfast cereal with yogurt instead of milk
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