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19 questions
a piece of equipment that is sent into space around the Earth to receive and send signals or to collect information
one part of a situation
the layer of gases around the Earth (or other planets)
the appearance of an area of land
a large area of flat land
a unit for measuring angles, shown by the symbol ° written after a number
to want to know something or to try to understand the reason for something
a powder of dirt or soil that you see on a surface or in the air
an area of low land between hills or mountains
a tool that is used for doing something
to discover or notice something
a fact that shows something exists or is true
extremely big
to make something happen or exist
new discoveries and inventions
a scientist who studies astronomy
to include the things that are needed for a particular purpose
relating to the most important or main part of something
something that is needed or demanded
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