earth, moon, and sun

by gia didomenico

earth in space

how does earth move in space?

earth moves through space in two major ways; rotation and revolution.

what causes the cycle of seasons on earth?

earth has seasons because its axis is tilted as it revolves around the sun

gravity and motion

Newton concluded that two factors - inertia and gravity - combine to keep Earth in orbit around the sun and the moon in orbit around earth.

what determines the strength of the force of gravity between two objects?

the strength of the force of gravity between two objects depends on the two factors; the masses of the objects and the distance between them.

what two factors combine to keep the moon and earth in orbit?

phases, eclipses, and tides

what causes the phases of the moon?

the changing relative positions of the moon, earth, and sun cause the phases of the moon, eclipses, and tides.

what are solar eclipses?

a solar eclipse occurs when the moon passes directly between earth and the sun, blocking sunlight from earth.

what are lunar eclipses?

during a lunar eclipse, earth blocks sunlight from reaching the moon.

what causes the tides?

tides are caused mainly by differences in how much the moon's gravity pulls on different parts of the earth.

earth's moon

what features are found on the moon?

features on the moon's surface include maria, craters, and highlands

what are some characteristics of the moon?

the moon is dry and airless. compared to earth, the moon is small and has large variations in its surface temperature.

Scientists theorize a planet-sized object collided with earth to form the moon.

how did the moon form?

buy our moon mousse!

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come visit the solar eclipse

at the moon shadow!

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solar eclipse


section 1

astronomy-the study of the moon, stars, and other objects in space.

axis-an imaginary line that passes through earth's center and the north and south poles, about which earth rotates.

rotation-the spinning motion of a planet on its axis.

revolution-the movement of an object around another object.

solstice-the two days of the year on which the sun reaches its greatest distance north or south of the equator.

calendar-a system of organizing time that defines the beginning, length, and divisions of a year.

orbit-the path of an object as it revolves around another object in space.

section 2

equinox-the two days of the year on which neither hemisphere is tilted toward or away from the sun.

force-a push or a pull exerted on an object.

gravity-the attractive force between objects; its strength depends on their masses and the distance between them.

law of universal gravitation-

mass-a body of coherent matter, usually of indefinite shape and often ofconsiderable size

weight- the amount or quantity of heaviness or mass; amount a thing weighs

inertia- inertness, especially with regard to effort, motion, action, and thelike; inactivity; sluggishness.

newton's law of motion- any of three laws of classical mechanics, either the law that a bodyremains at rest or in motion with a constant velocity unless anexternal force acts on the body (first law of motion) the law thatthe sum of the forces acting on a body is equal to the product of themass of the body and the acceleration produced by the forces, withmotion in the direction of the resultant of the forces (second law ofmotion) or the law that for every force acting on a body, the bodyexerts a force having equal magnitude and the opposite directionalong the same line of action as the original force (third law ofmotion or law of action and reaction)

section 3

phases- the particular appearance presented by the moon or a planet at agiven time.

eclipse-the partial or total blocking of one object in space by another.

solar eclipse- the obscuration ofthe light of the sun by the intervention of the moon between it anda point on the earth

umbra- the complete or perfect shadow of an opaque body, as a planet,where the direct light from the source of illumination is completelycut off.

penumbra- the partial or imperfect shadow outside the complete shadow of anopaque body, as a planet, where the light from the source ofillumination is only partly cut off.

lunar eclipse- the obscuration of the light of the moon by the intervention of theearth between it and the sun

tide- the periodic rise and fall of the waters of the ocean and its inlets,produced by the attraction of the moon and sun, and occurring aboutevery 12 hours.

spring tide- the large rise and fall of the tide at or soon after the new or the fullmoon.

neap tide- either of the two tides that occur at the first or last quarter of themoon when the tide-generating forces of the sun and moon opposeeach other and produce the smallest rise and fall in tidal level

section 4

telescope- an optical instrument for making distant objects appear larger andtherefore nearer.

craters-a large round pit caused by the impact of a meteoroid.

meteoroids- any of the small bodies, often remnants of comets, traveling throughspace: when such a body enters the earth's atmosphere it is heatedto luminosity and becomes a meteor.

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2 years ago