- Who is Jan H.Oort ?

- Dutch astronomer
- English astronomer
- French astronomer
- Irish astronomer
- On what depends the period of revolution of planets?

- Mass
- Chemical nature
- Size
- Distance to the Sun
- What is Bode's Law?

- A law to determine mass
- A law to determine distance between two planets
- A law to dtermine diameter
- A law to determine distance from the Sun
- Which diameter determine a planet ?

- The diameter is upper 400 km
- The diameter is upper 600 km
- The diameter is upper 800 km
- The diameter is upper 700 km
- At the end of how many years can we observe the Halley's comet ?

- 4
- 55
- 67
- 76
Astrophysical
- Oprettet 04/02/2017
- Udgivet 05/02/2017
- Ændret 05/02/2017
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