When the cloud contracts and powerful reactions start to turn hydrogen atoms into helium atoms to produce energy, a(n) …………………………… forms.

After billions of years, the hydrogen fuel of a star begins to run out and star expands to become a …………………………

1. A star that begins life with much more hydrogen than a medium size star such as our sun ends its life as an exploding star called a(n)………………………………

Very massive stars end their lives as …………………………… which are objects with gravity so powerful that even light cannot escape from them.

Stars are classified by their size,………………………………, and temperature.

The sun is a medium -size ………………………… star with a surface temperature of about 6000° C.

An object in space that makes its own energy including heat and light, is called a(n)……………………….

One light- year is about ……………………… billion kilometers.

The theory that the universe started at a single point, then began to expand is called the……………………………

A huge cloud of gas and dust in which stars form is a ……………………

What is a star called in its earliest stage?

A pattern of stars in the night sky is called a

The big dipper and Orion are the names of two

An optical telescope uses ……………………… or mirrors to make distant objects seem larger and nearer.

The orbiting Hubble space telescope ‘’sees’’ objects more clearly than earth based telescopes because earth’s ……………………………… does not change Hubble’s view.

Radio telescopes are giant dishes on earth’s surface that gather ……………………… waves from objects in space.

The solar system includes eight ………………………… that orbit the sun

The planet closest to the sun is ………………………

The planet farthest away from the sun is ……………………………

Mercury, Venus, Earth and mars are terrestrial planets with surfaces made of …………………………

Jupiter, Saturn, Uranus, and Neptune are jovian planets with surfaces made of…………………………

The most noticeable feature about ………………………… is the large set of rings that are made of ice and rock.

Scientists send ………………………………… to explore other planets.

Which planet in the solar system has the most moons?

Jupiter’s Great Red Spot is

Which planet has the hottest surface temperature?

Which is the largest planet in the solar system?

Which was the first planet to be explored by a space probe?

A star and the objects that move around it is called a(n)……………..

Scientists used to call Pluto a planet. Today, scientists call it a

A ……………………… is a tool used to make faraway objects appear closer and larger

A …………………… is a chunk of ice, dust and rock that moves around the Sun.

An ……………………… is a rock that moves around the Sun.

A meteoroid can enter Earth’s atmosphere. It is then called a……………

An object in space that makes its own energy, including heat and light, is called a(n)……………

Larger stars start with much more …………………… than medium stars

A black hole is an object with very strong ………………………

………………………… a group of stars that make a pattern in the night sky.

People can use ………………………to know directions.