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168 PLANETS

10-15: For these questions, choose the best 14 Kerry: Is there any water on the surface
option to fill in the blanks. of Mars?
10 Jimmy: What do you know about planets? Joe: To find this question’s answer, NASA
Tom: ...................... Because I want to be launched two robot explorers to Mars in
an astronaut in the future. 2003. ............ Because there were rivers
A) I travelled into space as a tourist two and seas on it many years ago.
years ago. A) They didn’t complete their mission
successfully.
B) I know a lot of things and I want to
EDİTÖR YAYINEVİ
learn more. B) There wasn’t life on Mars in the past.
C) Mercury is closer to the sun than the C) They didn’t find any proof for that.
Earth.
D) They discovered the evidence of water.
D) Our galaxy is called the Milky Way.

11 Mars is closest planet to Earth. If you 15 The Earth orbits the Sun in a year.
have a telescope, ..................... . ............ That’s why a year on Earth is

A) its atmosphere is different from Earth’s 365 days.
B) you can observe Mars easily A) Our solar system contains planets,
comets, gas, dust and some minor
C) Mars has two small satellites planets.
D) the gravity on Mars is less than Earth’s B) It takes 365 days to complete a full
orbit.

C) It turns 360° every day, so days and
12 Rick: .................................................. nights happen.
Kevin: Jupiter. A day on it is less than 10 D) A year on Earth is much shorter than a
hours. year on Pluto.
A) Which planet has the longest year?

B) Which is the biggest planet?
C) Which planet has the shortest day? 16 An astronomer, Clyde Tombaugh
discovered Pluto in 1930. Pluto was a
D) Which planet is the smallest? planet until 2006. Today it is a dwarf planet
because it’s very, very small. Smaller than
13 Anna: Do you know that people call Mars the Moon, and it has got one satellite,
as the red planet? Charon.
Steve: Yes, I know that. It is called this Which question is not answered in the
name because ................... . text?
A) its surface is red A) Who discovered Pluto in 1930?
B) the gravity on Mars is less B) Is there life on Pluto?
C) it is the coldest of all C) How many satellites does Pluto have?
D) it is not very hot D) Why is Pluto called a dwarf planet?