Astrophysics and Cosmology
完了要件
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O
ObservatoryA facility equipped with telescopes and scientific instruments for observing astronomical objects. | |
Orbitthe curved path of one object around another due to gravity. | |
Orbital periodthe time required to complete one orbit. | |
Orbital speedthe speed of an object as it travels through its orbit. | |
Orbital velocitythe velocity required for an object to follow a particular orbit. | |