How old is the universe it is?

It is composed of space and galaxies or billions of stars kept together.

It is an evidence that the Universe is expanding due to low temp waves indicating explosion.

It is a responsible for movement of dust clouds to form planets and stars.

It is a change in frequency of waves moving relative to its source.

In what it indicates of short wavelength?

In what it indicates the long wavelength?

Who proposed that the Universe is Expanding?

If stars are moving away from Earth and their light becomes dimmer, what do you call to that shift?

And if the stars are moving towards Earth and their light becomes brighter, what do you call to that shift?

It is a group of billion of stars.

____________ galaxies often appear bluish because they can contain many young stars.

_____________ galaxies often appear reddish because they contain many old stars.

What do you call to the large cluster of galaxies?

In what galaxy wherein solar system located?

What do you call to the theory about the "formation of solar system?"

He is the scientist who first proposed that the Earth and the other planets orbit the Sun.

The orbits of the planet were first said to be elliptical by ______________.

It is Kepler's 3 Laws of Planetary Motion that states the orbit of every planet is an ellipse with sun at one foci.

It is Kepler's Law of Planetary Motion that states the planet move fastest when closest to Sun and slowest when farthest from Sun.

It is Kepler's Law of Planetary Motion that states the comparison of the distance of each planet from sun and its orbital period around sun.

Which is the correct order of the planets that orbit the sun in Solar System?

Mercury, Venus, Earth, and Mars are the ____________________ planets.

Jupiter, Saturn, Uranus, and Neptune are the ____________ planets.