What is the Big Bang?

What is the Big Bang?The Big Bang theory is an effort to explain what

happened at the very beginning of our

universe about 15 Billion years ago.

How many galaxies are there?

• Hubble Space Telescope has observed 3,000 visible galaxies.

Is our sun in the center of our galaxy?

What is in a star?

• A star is a massive, luminous ball of plasma that is held together by gravity.

How are stars born? Are the stars all circles?

• A star is formed from the condensation of a hot cloud of gas and dust in space. When the cloud gets hot and dense enough, fusion—the combination of hydrogen atoms into helium atoms—begins to occur, producing starlight. Depending on the size of the cloud, a single star, a binary star (a system of two stars that orbit around a common center of gravity), or a cluster of stars may be formed.

What happens when two stars collide?

• They would make one large star.

2 colliding Galaxies

What color is the sun?

What is an eclipse?

July 7, 2009

August 21, 2017

What is the Earth?

How old is the Earth?

About 4.55 billion years

Why can’t you see the stars in the daytime?

You can see one star during the day -- the Sun! But because the sky is so bright (due to the Sun being bright), other stars are not visible. On the Moon, if you shield the Sun with your hand and let your eyes dark-adjust, you can see stars during the "day".

What are comets and asteroids?Comets and asteroids are small planets, ranging

in size from baseball-sized meteors to 1/3 the size of the moon. They are the rocky and icy bodies left over from the formation of the solar system. Originally, the population was much larger. With time, however, most of these bodies have either collided together to form the major planets, were ejected from the inner solar system into the Oort cloud, or were ejected out of the solar system altogether.

Every day, about 3000 tons of meteoroid dust falls to Earth.

How did rocks get into space? (asteroids)

Will a meteor rock ever hit the Earth?

• Yes

Friday, April 13 - The asteroid 99942 Apophis will pass within 30,000 km (18,600 mi) of the Earth, very briefly appearing as bright as 3rd magnitude. A possibility exists that Apophis could go through a 400 m wide "keyhole" on this pass which would put Apophis on a collision course with the Earth in 2036 [1].

What would happen if we explore our solar system?

• We have. We have sent probes to most of the planets to take pictures of them. We have only sent humans to the moon.

Is there life off of our planet?

• We do not know. Most astronomers believe that there is life out there, but we have not made contact. The universe is too huge not to have other life out there

Where can I fight some aliens?

• In your imagination!

What are Saturn's ring made of?

How cold are the giant gas planets?

-2440F -2900F -3500F -3730F

What is in a black hole? And what would happen to someone who

falls in?• No person has ever been close enough to

a black hole to actually fall into one, but if a person ever got close enough, their body would stretch out as they were pulled into the black hole. Spaghettification is the stretching of objects that fall into a black hole. It is called spaghettification because small objects will grow long and stringy like spaghetti as they are pulled into the black hole.

What is a worm hole?

• A wormhole is a theoretical opening in space-time that one could use to travel to far away places very quickly. The wormhole itself is two copies of the black hole geometry connected by a throat.

What is a parallel universe?

• The multiverse is the hypothetical set of multiple possible universes (including our universe) that together comprise all of reality. The different universes within the multiverse are sometimes called parallel universes.

What is the twin paradox?

• http://www.pbs.org/wgbh/nova/einstein/hotsciencetwin/

When we all die, will there be life again?

• That is a personal decision you will have to come to on your own. Learn about science and several religions, talk with your family and make up your own mind.