1 ESO Science. Unit review

1. The Earth in the universe

2. • What models were proposed to explain
the Earth´s position in the Universe?

3. Identify the model or theory
• It was proposed by Aristarchus de Samos and
Copernicus.
• The Earth is in the centre of the Universe
• It was verified by Galileo
• It says that the Sun is in the centre of the
Universe
• It was proposed by Aristotle and Ptolemy
• 16th century

4. What units of measurement are used
in astronomy?
• Light-year
• Parsec
• Astronomical units

5. Galaxies are made of:
• Stars…
• Nebulae
• Dust and gas

6. Our galaxy is
• The Milky Way
• A spiral galaxy
• Located in the galaxy cluster
– The Local group
• The solar system is in the:
– Orion arm

7. What do you know about stars?
• Do they emit light?
• Why?
• What happens when a star consumes the
hydrogen?

8. The Solar System
• What are the main celestial bodies?
– Planets
– Dwarf planets
– Asteroids
– Comets
– Satellites

9. Where can we find?
• Asteroids?
– Asteroid belt. Where is it?
– Kuiper belt. Where is it?
• Comets?
– Oort cloud

10. What movements have the planets?
• Rotation
• Revolution

11. Compare the inner and the outer
planets
• Composition
• Closer or farther from the Sun
• Low or high number of satellites
• Atmosphere
• Other things

12. What planet?
• Has no atmosphere?
– Mercury
• The only planet where life has been found
– The Earth
• It rotates in an opposite direction and has a
dense atmosphere
– Venus

13. • Is the largest?
• Jupiter
• Its well-known for its famous rings
• Saturn
• The farthest planet
• Neptune
• It has the Great red spot
• Jupiter
• The red planet
• Mars

14. What causes the seasons on Earth?
• The movement of revolution
• The tilt of the Earth´s axis

15. True or false
• In summer in the Northern hemisphere, the
Sun rays strike the Earth perpendicular.
• In summer the solar rays hit the Earth at an
angle in the northen hemisphere
• The axis of the Earth is tilted towards the Sun
in Summer.

16. What are the phases of the Moon?

19. What is it?

20. https://www.youtube.com/watch?v=l37o