This document discusses unidentified flying objects (UFOs) and the possibility of alien life. It defines a UFO as any unidentified object seen in the sky and outlines some common shapes reported. The document also defines aliens as any extraterrestrial life not originating from Earth. It briefly summarizes some historical UFO sighting events and proposes the ancient alien theory that aliens may have visited Earth long ago and influenced human civilization, pointing to some archaeological evidence. The document considers the possibility that aliens may be disguising themselves as humans or that their presence could cause changes to conditions on Earth or conflicts.

1. Unidentified Flying
Object and Alien
Lecturer: Pham Cong Ngoc
Student: Doan Van Thai
ID: 1553090869

2. Do UFO- Alien exist?

3. • There are about 100-
400 billion stars like
sun in our galaxy.
• Planets have enough
condition to live is
about 10 billions.

4. I. What is UFO, Alien?
• It’s any apparent
anomaly in the sky that
is not identifiable as a
known object or
phenomenon.
• Created in 1953 by
the United States Air
Force (USAF).

5. I. What is UFO, Alien?
• Shapes of UFO:

6. I. What is UFO, Alien?
• Alien is all extraterrestrial life, life which
does not originate from Earth.

7. II. Historical Events
1. The Rosswell Incident.

8. II. Historical Events
2. The Beatle Of Los Angeles.

9. II. Historical Events
3. Area 51.

10. II. Historical Events
4. Crop Circles.

11. III. Hypotheses
If the alien exist, where are they?
•Ancient Alien Theory: Thousand of years ago,
aliens landed on earth. They helped shape human
civilization.
Some evidence:

12. III. Hypotheses
•Life condition changes.

13. III. Hypotheses
• Civil war, conflict.

14. III. Hypotheses
• Disguising into human.

15. IV. References
 https://vi.wikipedia.org/wiki/V%E1%BA
%ADt_th%E1%BB%83_bay_kh
%C3%B4ng_x%C3%A1c_
%C4%91%E1%BB%8Bnh
 https://vi.wikipedia.org/wiki/V%E1%BA
%ADt_th%E1%BB%83_bay_kh
%C3%B4ng_x%C3%A1c_
%C4%91%E1%BB%8Bnh
 https://www.youtube.com/watch?
v=QEXTYboQ3FU