2) Fill in: atmosphere, surface, stars, radio, dwarf, particles, waves, solar, telescopes.

А) You cannot hear sound in space because there are not enough1) for sound 2) to travel through.

B) However, astronauts can communicate thanks to 3) waves.

C) The footprints of the astronauts will stay on the moon's 4).. … for at least 100 million years.
D) This is because the moon has no 5)….. so there's no wind or water to wash them away.

E) 6)…. like our sun give light and warmth to planets like ours. As they grow older they get hotter and expand, pulling the planets nearby towards them, and eventually swallowing them completely.
F) This may happen to the Earth but not for another five billion years or so!

7) planet, Pluto, lies in a dark and mysterious place in our 8)…..
system and was named by an 11-year-old girl called Venetia Burney in 1930.

G) She had read about Greek and Roman mythology and she thought of calling it Pluto.

H) The red spot on Jupiter is a giant storm with winds reaching 640 kmph.

I) It's been there since people first looked at Jupiter through 9)……...around 400 years ago.

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