letter once only, you have one extra answer which is not used.
TASK 19
Which planet
1. was discovered in the last century?
2. got its name because of its distinction from other celestial bodies?
3. is the hottest?
4. is known for its density?
5. comes the second after Jupiter in size?
6. was discovered by a musician?
A
Venus, one of the planets in the solar system, is the second in distance from the Sun.
Except for the Sun and the Moon, Venus is the brightest object in the sky. The planet is
called the morning star when it appears in the east at sunrise, and the evening star when it
is in the west at sunset. Venus is never visible more than three hours before sunrise or
three hours after sunset. Venus has a carbon dioxide atmosphere 90 times thicker than
that of Earth, causing an efficient greenhouse effect by which the Venusian atmosphere is
heated. The resulting surface temperature is the hottest of any planet — about 477°C.
B
Jupiter is the largest planet in the solar system. The fourth brightest object in Earth’s sky,
after the Sun, the Moon, and Venus, Jupiter is more than three times brighter than Sirius, the
brightest star. Due to its prominence in the sky, the Romans named the planet for their chief god,
Jupiter. Unlike the rocky inner planets of the solar system (Mercury, Venus, Earth, and Mars),
Jupiter is a ball of dense gas and has no solid surface.
C
Neptune is the fourth largest planet in diameter. Astronomers believe Neptune has an inner rocky
core that is surrounded by a vast ocean of water mixed with rocky material. From the inner core,
this ocean extends upward until it meets a gaseous atmosphere of hydrogen, helium, and trace
amounts of methane. Neptune has four rings and 11 known moons.
D
Pluto is farther from the Sun than the other planets in the solar system. The small, rocky, and cold
planet takes 247.7 years to revolve around the Sun. Pluto is about 2,360 km in diameter, about
two-thirds the size of Earth’s moon. Discovered in 1930, Pluto is the most recent planet in the
solar system to be detected.
E
Uranus is a major planet in the solar system. Uranus has 11 known rings and 27 confirmed moons.
The mass of Uranus is 14.5 times greater than the mass of Earth, and its volume is 67 times
greater than that of Earth. Uranus was the first planet that people discovered by using a telescope.
Sir William Herschel, a German-born British musician and astronomer, discovered the planet in
1781.
F
Mercury orbits closest to the Sun of all the planets, at an average distance of approximately 58
million km. Mercury is surprisingly dense, apparently because it has an unusually large iron core.
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