A. CREATE B. CAUSE C. DO D. MAKEVI. READ THE PASSAGE CAREFULLY. CH...

28. a. create

b. cause

c. do

d. make

VI. Read the passage carefully. Choose the correct answer and decide if

the statements are true (T) or false (F)

How many planets are there in our galaxy? That’s a tricky question to answer. Are there

other planets that support life? That’s exactly what the Helper mission hopes to discover.

NASA launched the Helper space telescope, designed to find habitable planets, in 2009.

So far it has discovered five new Earth-sized planets beyond our solar system. These

planets are hotter than the Earth’s sun - much too hot for life as we know it. The Helper

team predict that they will need at least three years (and possibly longer) to find an Earth-

like planet.

The simplest requirement for a planet to have life (carbon-based life like on Earth) is for

there to be liquid water (not frozen or gas) so the distance from the planet’s sun and

therefore temperature are important. There also needs to be the correct amount of air. If a

planet is as small as Mars (half the size of Earth) its weak gravity means that it can’t hold

on to air molecules. If a planet is Neptune sized (four times bigger than Earth) it has very

strong gravity and too much air. So size matters too. Will we be sad if we discover we are

alone in our galaxy or happy if we find that we share it with other life forms?