Vocab Solar System Flashcards
Orbit
the circular path of an object as it revolves around another object
Solar System
a system of objects that revolve around a star
Galaxy
a group of solar systems, dust, and gas held together by gravity; our solar system is part of the Milky Way galaxy
Universe
everything that exists in, on and around the Earth
Satellite
a natural or artificial object that revolves around another object in space
Tides
Rise and fall of the ocean caused by the gravitational pull of the sun and moon.
Impact Crater
The Moon’s surface is covered with bowl shaped holes called craters. The Barringer Crater was made by a meteor that struck Earth thousand of years ago.
Rotation
Rotation is the act of spinning around an axis. Earth rotates on its axis, which is “tilted” in relation to the Sun. This causes our seasons.
Revolution
The movement of an object around another object, in an orbit,is called revolution. Earth completes one revolution around the Sun, every 365.26 days, in an elliptical orbit. The Moon also revolves around Earth in an orbit of 27.3 days.
Season
As Earth revolves around the Sun, it’s tilted axis causes some parts to be pushed toward the Sun and others away from it. During June, the Northern hemisphere is tilted toward the Sun, and places like North America, Europe, and Asia experience summer. During this time, the Southern hemisphere experiences winter.
Equinox
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).
Solstice
A solstice is an astronomical event that occurs twice each year (in June and December) as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere. Both the solstices and the equinoxes are directly connected with the seasons of the year.
Eclipse
An eclipse is an astronomical phenomenon caused by the revolution of the Moon around Earth. When the Moon moves into Earth’s shadow, we see a lunar eclipse. When the Moon is positioned directly between Earth and the Sun, its shadow falls on Earth, producing a solar eclipse.
Umbra
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.Compare with penumbra.
Penumbra
the partially shaded outer region of the shadow cast by an opaque object.