• What is Astrophysics?

• Evolution of Universe

• The Solar System

• Size comparison of Planets

• Meteors and Comets

• Black Hole

• Time Travel

• Extraterrestrial Life

• References

You need to know the about the planets

• A meteoroid is a small rocky or metallic body

travelling through outer space.

• A meteor is a bright streak of light

in the sky(a "shooting star”)

produced by the entry of a

small meteoroid into

the Earth's atmosphere.

• Black holes are the strangest objects in the Universe.

A black hole does not have a surface,

like a planet or star.

• Black holes come in different sizes.

Many of them are only a few times

more massive than the Sun.

• Objects that fall into black holes

are literally stretched to

breaking point.

Time travel is the concept of movement

(such as by a human) between certain

points in time, analogous to movement

between different points in space,

typically using a hypothetical device

known as a time machine, in the

form of a vehicle or of a portal

connecting distant points

in time.

• The problem occurs with paradox.

• At the most basic level, a paradox is a statement that is self contradictory because it often contains two statements that are both true, but in general, cannot both be true at the same time.

• Similarly in a situation of paradox, you would see yourself by going through the past. But this is not possible.

• Hence, it makes time travel actually possible.

• Extraterrestrial life is life that does not originate from Earth. It is also called alien life, or, if it is a sentient and/or relatively complex individual, an "extraterrestrial" or "alien" Although many scientists expect extraterrestrial life to exist,

there is no unambiguous evidence

for its existence so far.

• Aliens are yet mysterious, but some

proofs of these extraterrestrial life

have been found and surely these

mysteries would be explored.

• The Milky Way galaxy we live in, is one among the BILLIONS in space.

• There may be a huge black hole in the middle of the most of the galaxies.

• If you fell into a black hole, you would stretch like a rubber band.

• The opposite of a black hole is estimated as white hole which spray out matter and light like fountains.

• A day on Mercury lasts as long as 59 days on Earth.

• Humans can distinguish between at least a trillion smells.

• There’s a planet which rains glass ( HD 189733b).

• 111,111,111 * 111,111,111 = 12345678987654321

• If you put Saturn in a bathtub, it would float.

• The Universe has no center and is constantly expanding every second.