Question

1. choose the best answer.

halley’s comet can be seen from earth about every ____ years.
67
76
17
176

1. choose the best answer.

the ____ robotic probe was the first to land on a comet, landing on comet 67p in 2014.
venera
viking
n1
philae

Explanation:

Question 9

Halley's Comet has an orbital period of about 76 years, meaning it is visible from Earth approximately every 76 years. The other options (67, 17, 176) do not match the known orbital period of Halley's Comet.

Philae was the robotic probe that was the first to land on a comet (Comet 67P) in 2014. Venera probes were for Venus, Viking for Mars, and N1 was a Soviet rocket. So the correct probe is Philae.

Answer:

76 (the option corresponding to 76)

Question 10