Flashcards in Planet Vocab Deck (34):
the circular or elliptical path of an object as it revolves around another object
a system of objects that revolve around a star
a group of solar systems, dust, and gas held together by gravity; our solar system is part of the Milky Way galaxy
everything that exists in, on and around the Earth
The Moon is a natural satellite that orbits Earth. The planet Jupiter has many moons, four of which are Io, Europa, Ganymede, and Callisto. Artificial satellites are made by man and launched to orbit Earth and other planets.
An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body.
the spinning of a celestial body, such as a planet, around an axis
the orbiting of an object around another object
a period of the year determined by the position of Earth as it revolves around the sun
the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20).
either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.
The lunar maria are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas.
an event whereby one astronomical body passes between two other astronomical bodies
the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
The partially shaded region of a shadow cast by an opaque
The distance from earth to the sun
A novel shape traced by a point moving in a plane so that the sum of its distance from two other points are constant
A planet made of rock
A large planet with low density and consists of hydrogen and helium
A small object made of rock or metal that orbits the sun.
A body of ice and dust that travels in a long narrow orbit
A streak of light in the sky that forms when a piece of rock from space burns up in earths atmosphere
A piece of rock or metal from space that hits earths surface
Having the earth as the center
Having the sun as the center
A force that exists between any two objects that have mass
The rise and fall of the oceans surface levels due to the gravitational pull of the sun and moon
(Of the moon new and full)have a progressively smaller part of its visible surface illuminated,so that it appears to decrease in size .
(Of the moon) have a progressively smaller part of its visible surface illuminated,so that it appears to decrease in size.
Any moon that appears more than half lighted but less than full.
Thin curved shape that’s thicker in the middle and tapers to thin points at each end
The phase of the moon in which the whole disk is illuminated
The phase of the moon in which it is in conjunction with the sun and invisible from earth