An idea that you consider true for which you are seeking proof
To move around a large object in space such as a planet
A shooting star
The first satellite of the United States
Something that causes a change in the motion of an object
A building designed and equipped to observe astronomical phenomena
The Northern Lights, for example
The circle of light around the sun or the moon
The position of an object, or the direction in which it is pointing
ANSWERS:
Theory
Orbit
Meteor
Explorer
Force
Observatory
Aurora
Corona
Orientation
Weekend on 05/04/2016