Structures in Space
There are also structures in space.
The International Space Station (ISS) is a research
It's about 350 kilometers above Earth.
It goes around Earth about 16 times every day.
It travels at 27,700 kilometers per hour - that's nearly
8 kilometers per second!
You can see the ISS from telescope.
The ISS is made of metal.
It uses energy from the sun.
The first part of the ISS went into space in a rocket
No astronauts went with it.
Most other parts went with astronauts.
Sometimes, astronauts do a spacewalk outside the ISS
to attach new parts.