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BJU Space/Earth - 5
BJU - Space and Earth Science - Chapter 5
Term | Definition |
---|---|
The fraction or percentage of the light shining on a planet or other nonluminous celestial object that it reflects. | albedo |
The point in the orbit of a planet or other object orbiting the sun where it is farthest from the sun. | aphelion |
A unit of astronomical distance equal to the average distance between Earth and the sun (150 million km or 93 million miles). | astronomical unit |
The large central gap in Saturn's ring system when viewed from Earth. The Cassini-Huygens mission to Saturn demonstrated that the Cassini Division actually contains thousands of thin rings. | Cassini's Division |
A special geometric figure that can best be described as a flattened circle. Given 2 points in a plane, an ellipse consists of all the other points in the plane such that the sum of their distances from the two given points is a constant. | ellipse |
A point of geometric significance in the description of a system of points or physical phenomena. One of 2 points used to define an ellipse. | focus |
Any of Jupiter's four largest moons that were named after their discoverer, Galileo Galilei. | Galilean moons |
One of the large, gaseous planets: Jupiter, Saturn, Uranus, or Neptune. Also called a Jovian planet.gas | giant |
A reddish colored, oval-shaped area within the atmosphere of Jupiter that is probably a centuries long storm system. | Great Red Spot |
One of the planets whose orbit is closer to the sun than the Earth's orbit. | inferior planet |
Resembling the planet Jupiter or pertaining to Jupiter or the Jupiter-like planets. | Jovian |
A measure of the amount of matter an object contains; not dependent on the force of gravity. | mass |
The eclipsing of a heavenly body such as a star or planet by the moon or another planet. | occult |
The point nearest the sun in the orbit of a planet or other sun-orbiting object. | perihelion |
The appearance of the moon according to the amount of the lighted side that is visible from Earth. | phase |
Any large body orbiting any star. One of the nine largest bodies orbiting the sun. | planet |
The apparent backward movement of the superior planets caused by the difference in orbital speed between Earth and the planet being observed. | retrograde motion |
A planet whose orbit is farther from the sun than the Earth's orbit. | superior planet |
The gravitational force measured at the actual or designated surface of a celestial object. | surface gravity |
The passage of an inferior planet across the sun's disk. | transit |
The force of gravity exerted on an object. | weight |