any object that exists in space

a celestial object that is made up of hot gases

a round celestial object that orbits around one or more stars

when an object does a 360 degree turn on its axis

when an object rotates fully around another object

Three pieces of evidence showing the Earth is round

the first astronomers made observations ___ ago

the process of determining the location of a point by measuring two angles at either end of a fixed baseline

helps in triangulation by measuring the angle above the horizon

patterns of shapes people and animals in the sky

light travels the distance of ____ in a year (light year)

light travels at the speed of ____

brightness of a star seem from Earth

The North Star is also known as ____

the pointer stars are the ___

all stars move slowly ____ throughout the year

The earth's orbit around the Sun is ____

The Earth's axis is tilted at an angle of ____

Higher concentration of sunlight
warmer temperature

Lower concentration of sunlight
Cooler temperature

The moon orbits the Earth in about ___

by the time it finishes to revolve around the earth, the moon spins ___ on its axis

the moon's _____ and ____ are the same

the ____ of the Moon is always facing the Earth

phases if the Moon

Waxing

Waning

Gibbous

Crescent

When one celestial body passes directly in front if another

Happens __ a year

The solar eclipse also occurs twice a year

Caused by the gravitational force between the Earth and the Moon

the moon pulls at everything on Earth but only water can move.

why do we not see a solar eclipse every time the Moon is between the Sun and Earth?

Far more people have seen a lunar eclipse than a solar eclipse. Why?

The universe is defined as

the universe is ___ old

1 AU is....

Our solar system is comprised of

Planets are held in orbit by ...

The Earth is moving about ___

The first model of the solar system

The Geocentric Model states that __ is at the center and everything in the solar system orbits it

The model that stated that everything in the solar system orbits the Sun

_____ developed the Heliocentric Theory in the ____

A planet has to meet three criteria

an object that's made up of rocky materials, ice, and gas

where does comets come from?

Why do their tails always point away from the Sun, regardless of it they're travelling towards or away from it?

piece of rock that's moving through space

a meteoroid that hits Earth's atmosphere and burns up

a meteoroid that passes through the Earth's atmosphere without getting totally burned

what are shooting stars really?

Challenges of space travel

Two types of space exploration

Telescopes can detect....

Radiation is...

Examples of radiation are...

Optical telescopes can..

The two types of optical telescopes are...

Refracting telescopes uses...

Reflecting telescopes uses...

Non optical telescopes can...

Radio waves are able to...

you can use non optical telescopes on...

Radio waves are ______________ on the receiver

A ___ amount of the radiation from space is absorbed by the Earth's atmosphere

Telescopes are placed in ___ above the _____

Pros about telescopes in space

cons about telescopes

Orbiters are ..

Orbiters can ...

cons about orbiters

Landers are

Landers can..

Landers can only last for

Satellites are...

satellites are ____ because

a GPS stands for

a GPS is programmed in

Remote - sensing satellites can...

Scientists use the remote sensing satellite to

Satellites that are located farther away from the Earth and takes 24 hours to orbit the earth are called ...

Geosynchronous Satellites are used to...

The most important celestial object for life on earth is

The Solar System was formed from ...

The Solar System was also formed from ...

Where did the Sun come from?

What is the Sun composed of?

Nuclear fission is ...

When the Sun grows, ....

The sun's lifespan is

Features of the Sun