Question

Now read the following text and make a mind map using words from the text that can ex- plain what space junk is. Then, compare your map with your friend’s.
WHAT IS ORBITAL DEBRIS?
Orbital debris (duh BREE) is “junk” that is circling Earth. It is pieces from spacecraft. Humans have been launching objects into space for more than 50 years. Most of the objects have fallen back to Earth. A piece of debris falls back to Earth about once a day. These objects either land or burn up in the atmosphere. Most objects that return to Earth end up in the water, since it makes up 70 percent of Earth’s surface. But many of the objects sent into space are still in orbit around the Earth. [...]
Why Is Orbital Debris Important?
Most “space junk” is moving very fast and it can reach speeds of 4.3 to 5 miles per second. Five miles per second is 18,000 miles per hour. That speed is almost seven times faster than a bullet. And if a spacecraft is moving toward the debris, the total speed at which they collide can be even faster. The average impact speed of a piece of orbital debris running into another object is 22,370 miles per hour. Since it is moving so quickly, a tiny piece of orbital debris can cause a lot of damage. Being hit by a piece of debris smaller than half an inch around - traveling at about six miles per second - would be like being hit by a bowling ball moving at 300 miles per hour.
How Much Debris Is in Orbit?
To keep astronauts safe, scientists use radars to keep track of all the debris in orbit. They classify it by its size. About 13,000 known objects are bigger than 10 centimeters in diameter. Scientists believe that there are more than 100,000 pieces of orbital debris between 1 cm and 10 cm. And tens of millions of pieces are smaller than 1 cm. All pieces of debris larger than 10 cm are carefully tracked using radars and telescopes. That information is used to estimate the number of small pieces of debris. Even though they cannot detect every piece, scientists have an idea of the amount of debris that is out there.
To determine how many pieces of very small debris - smaller than 1 millimeter - are in orbit, scientists study the space shuttle when it returns from orbit. They look for damage from debris impacts. When

128 CADERNO DO ALUNO
the space shuttle returns from missions, scientists count the number of impacts it experienced. They then compare the number of dents or holes to the amount of space shuttle traveled through. These comparisons help them estimate how many of the tiny objects are in orbit around the Earth. [...]

Answer 1

Resposta:

Bits of metal - pedaços de metal

Tony flecks of Paint -pequenas manchas de tinta

Orbital Débeis - Lixo espacial

Pieces From space craft - peças de naves espaciais

objects - objetos

Explicação:

Você deve encontrar palavras comum nos dois textos