2. • What is Astrophysics?
• Evolution of Universe
• The Solar System
• Size comparison of Planets
• Meteors and Comets
• Black Hole
• Time Travel
• Extraterrestrial Life
• References

5. You need to know the about the planets

10. • 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.

11. • 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.

12. 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.

14. • 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.

15. • 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.

16. • 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.

17. • 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.