1. Annapaola & Francesca Donateo
present

2. ASTRONOMY

3. What’s astronomy?
It’s the branch of geography which helps us to get acquainted with the sky. It is also the study of the sun, the moon, the planets and other astronomical bodies. It includes learning about the Earth, because the Earth, too, is a planet.

4. What are stars? When we observe the sky on
a clear, dark night, the first thing that
we note are the stars, seen as little pinpoints of light.
But …

5. Stars
Stars are astronomical body of gaseous composition, animated by nuclear reactions, able to give out energy in the form of electromagnetic radiations. They are made of helium and hydrogen.

6. Often stars appear grouped in pictures that we called constellations
Often stars appear grouped in pictures that we called constellations. However stars aren’t at the same distance … it’s only an illusion of the observer. The most important constellations are …

7. Orion
Orion is a constellation formed by 130 stars and the alignment of three of them form the so-called Orion’s belt.

8. Ursa Maior and Ursa Minor
Ursa Major is a constellation of typical boreal skies, its seven brightest stars, grouped in the famous Big Dipper asterism, are visible throughout the year in the northern hemisphere.
Ursa Minor is a constellation of the northern sky. It is especially known because within it lies the north celestial pole, although its position is subject to a continuous, slow movement due to the precession of the Earth's rotation. The Little Dipper is easily identifiable because, once detected the Big Dipper, you can reach the Pole Star, the brightest star in Ursa Minor

9. Cassiopeia
Cassiopeia is a northern constellation, representing Cassiopeia, the legendary queen of Ethiopia. The constellation is easily recognized by its shape W or M.

10. Observing the sky, it seem that everything revolve around the Earth, that appeared to be the motionless of the universe. But today we know that only the moon revolves around the planet. The Earth itself travels around the Sun with other seven planets in the Solar System.

11. The Sun is the centre of the Solar System, around which everything revolves. It is also the only
source of energy, the same
that terrestrial organisms
exploit to perform their
normal activities.
The Sun is one of numerous stars
that form our galaxy, called the Milky Way.

12. Milky way
It’s an enormous discus of stars (100 milliards) long about light-years and thick light-years. It’s characterized by a central swelling , called galactic nucleus, from which depart arms, where the density of the stars is higher.

13. The solar
system

14. The solar system is the planetary system formed by a variety of celestial bodies kept in orbit by the force of gravity of the Sun, the Earth also belongs to it. Is composed of eight planets, by their natural satellites, five dwarf planets and billions of small bodies. The planets that compose it are …

15. Mercury

16. Venus

17. Earth

18. Mars

19. Jupiter

20. Saturn

21. Uranus

22. Neptune

23. Thanks for your attention.
The end
Thanks for your attention.