white pitch black grey
2) Pick the false statement:
Tycho Brahe proved that comets were outside the atmosphere of the Earth. Johannes Kepler believed comets travelled in straight lines. Isaac Newton proved that most comets have circular orbits.
3) Which statement is correct?
Comets have tails at all points in their orbits, not just when they are close to the Sun. The further away a comet is from the Sun, the more it looks just like a star. Comets always have a nucleus and a coma.
4) Icy asteroids that have unstable orbits might become comets when their orbits gets changed into those of comets.
True False
5) Did Charles Messier catalogue objects in the sky that looked like comets, to help him discover real comets?
Yes No
6) Pick the true statement:
Hundreds of years ago, people thought comets were good omens. When the Earth passes through a comet's tail, this results in spectacular meteor showers. When the Earth passes through a comet's tail, this results in many worldwide earthquakes.
7) Are most comets discovered near the eastern horizon before sunrise?
8) Which statement is false?
Comet Halley's period varies from about 750 years to 800 years. Comet Halley's period is affected by the strong gravitations of planet Jupiter and planet Saturn.
9) The Greek word kometes means: hairy one.
10) Are periodic comets divided into 4 groups: short-period comets, medium-period comets, long-period comets and very long-period comet?
