p114-p115 ＜ LANDMARK English Communication Ⅰ｜啓林館デジタル教科書

How will the space elevator be built? /

First, / a

<span class='nw'>stationary</span> <span class='nw'>satellite</span> will be <span class='nw'>launched</span> / to a point / about

[36,000] km / <span class='nw'>above</span> the Earth’s <span class='nw'>equator</span>. /

This is the

place / where the Earth’s <span class='nw'>gravity</span> and the <span class='nw'>centrifugal</span>

force / are in <span class='nw'>balance</span>. /

Next, / a <span class='nw'>cable</span> will be <span class='nw'>stretched</span>

<span class='nw'>downward</span> / from the satellite, / and <span class='nw'>upward</span> as well / to

keep the balance. /

The downward part of the cable /

will finally reach the Earth’s <span class='nw'>surface</span>. /

When the

elevator is <span class='nw'>fixed</span> / to this cable, / it will be able to climb

up and down / along the cable. /

How long will it take / to go into space / on the

space elevator? /

The elevator is expected / to run on

<span class='nw'>electricity</span> / at 200 to 300 km <span class='nw'>per</span> hour. /

Therefore, /

the elevator will take one or two hours / to reach the

height of the International Space Station (ISS), / about

400 km / above the Earth. /

This is the place / where

several astronauts always stay. /

In order to reach

the stationary satellite / about [36,000] km / above the

Earth, / the elevator will take about one week. /

<span class='nw'>linear</span> <span class='nw'>motor</span> technology is used, / the travel time will

become much shorter. /

Questions

Q3	A stationary satellite will be launched to a point about 36,000 km above the Earth’s equator.
Q4	It will take one or two hours.

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