Planet Vocab Flashcards Preview

6th period > Planet Vocab > Flashcards

Flashcards in Planet Vocab Deck (34):
1

Orbit.

the circular or elliptical path of an object as it revolves around another object

2

Solar system

a system of objects that revolve around a star

3

Galaxy 🌌

a group of solar systems, dust, and gas held together by gravity; our solar system is part of the Milky Way galaxy

4

Universe

everything that exists in, on and around the Earth

5

Satellite

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.

6

Impact crater

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.

7

Rotation

the spinning of a celestial body, such as a planet, around an axis

8

Revolution

the orbiting of an object around another object

9

Season

a period of the year determined by the position of Earth as it revolves around the sun

10

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).

11

Solstice

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.

12

Mare

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.

13

Eclipse

an event whereby one astronomical body passes between two other astronomical bodies

14

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.

15

Penumbra

The partially shaded region of a shadow cast by an opaque

16

Astronomical unit

The distance from earth to the sun

17

Ellipse

A novel shape traced by a point moving in a plane so that the sum of its distance from two other points are constant

18

Terrestrial planets

A planet made of rock

19

Gas planet

A large planet with low density and consists of hydrogen and helium

20

Asteroid

A small object made of rock or metal that orbits the sun.

21

Comet

A body of ice and dust that travels in a long narrow orbit

22

Meteor

A streak of light in the sky that forms when a piece of rock from space burns up in earths atmosphere

23

Meteorite

A piece of rock or metal from space that hits earths surface

24

Geocentric

Having the earth as the center

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Heliocentric

Having the sun as the center

26

Gravity

A force that exists between any two objects that have mass

27

Tide

The rise and fall of the oceans surface levels due to the gravitational pull of the sun and moon

28

Waxing

(Of the moon new and full)have a progressively smaller part of its visible surface illuminated,so that it appears to decrease in size .

29

Waning

(Of the moon) have a progressively smaller part of its visible surface illuminated,so that it appears to decrease in size.

30

Gibbous moon

Any moon that appears more than half lighted but less than full.

31

Crescent moon

Thin curved shape that’s thicker in the middle and tapers to thin points at each end

32

Full moon

The phase of the moon in which the whole disk is illuminated

33

New moon

The phase of the moon in which it is in conjunction with the sun and invisible from earth

34

Quarter moon

Occurs when the moons illuminations is increasing