pp ac e nk-|||-太空垃圾-|||-1 In 1997 Lottie Williams was-|||-walking through a park in-|||-Oklahoma,in the US,with her-|||-friends.Suddenly somethin-|||-tapped her on the shoulder-|||-and fell to the ground.She-|||-picked the object up.It was-|||-about as heavy as an empty-|||-soda can.Later,scientists told-|||-her it was a piece of a Delta II-|||-rocket that had been used to-|||-launch a satellite.-|||-2 Many countries around the-|||-world have sent satellites into-|||-space.We need satellites to-|||-send and receive TV and radio-|||-signals,to report the weather-|||-and for many other things.But when they become old or they break down or we don`t-|||-need them any more,we just leave them there.They become space junk.-|||-Scientists think there are about 1616,000 objects larger than 10 centimeters wide flying 20-|||-around the Earth,and tens of millions of smaller objects too.They travel at around-|||-7 kilometers a second.That`s fast!And it`s their speed that makes these pieces of space-|||-junk really dangerous.If one small piece of space junk hits something at high speed,it-|||-can do a lot of damage.Luckily,there haven`t been many collisions.But in 2009,an-|||-old Russian satellite hit and destroyed an American satellite-and that created 2,000-|||-new pieces of space junk!-|||-Pieces of space junk re-enter the Earth`s atmosphere every day.But Lottie Williams-|||-is the only person who has been hit.The piece that hit her was light,and the air in the-|||-atmosphere had slowed it down.Most space junk burns up and doesn`t reach the-|||-Earth`s surface.But in 2011,a metal ball 35 centimeters wide fell to Earth in-|||-Namibia,Africa.It made a hole in the ground 30 centimeters deep and over 3 meters-|||-wide.Lottie was lucky she wasn`t hit by that!pp ac e nk-|||-太空垃圾-|||-1 In 1997 Lottie Williams was-|||-walking through a park in-|||-Oklahoma,in the US,with her-|||-friends.Suddenly somethin-|||-tapped her on the shoulder-|||-and fell to the ground.She-|||-picked the object up.It was-|||-about as heavy as an empty-|||-soda can.Later,scientists told-|||-her it was a piece of a Delta II-|||-rocket that had been used to-|||-launch a satellite.-|||-2 Many countries around the-|||-world have sent satellites into-|||-space.We need satellites to-|||-send and receive TV and radio-|||-signals,to report the weather-|||-and for many other things.But when they become old or they break down or we don`t-|||-need them any more,we just leave them there.They become space junk.-|||-Scientists think there are about 1616,000 objects larger than 10 centimeters wide flying 20-|||-around the Earth,and tens of millions of smaller objects too.They travel at around-|||-7 kilometers a second.That`s fast!And it`s their speed that makes these pieces of space-|||-junk really dangerous.If one small piece of space junk hits something at high speed,it-|||-can do a lot of damage.Luckily,there haven`t been many collisions.But in 2009,an-|||-old Russian satellite hit and destroyed an American satellite-and that created 2,000-|||-new pieces of space junk!-|||-Pieces of space junk re-enter the Earth`s atmosphere every day.But Lottie Williams-|||-is the only person who has been hit.The piece that hit her was light,and the air in the-|||-atmosphere had slowed it down.Most space junk burns up and doesn`t reach the-|||-Earth`s surface.But in 2011,a metal ball 35 centimeters wide fell to Earth in-|||-Namibia,Africa.It made a hole in the ground 30 centimeters deep and over 3 meters-|||-wide.Lottie was lucky she wasn`t hit by that!pp ac e nk-|||-太空垃圾-|||-1 In 1997 Lottie Williams was-|||-walking through a park in-|||-Oklahoma,in the US,with her-|||-friends.Suddenly somethin-|||-tapped her on the shoulder-|||-and fell to the ground.She-|||-picked the object up.It was-|||-about as heavy as an empty-|||-soda can.Later,scientists told-|||-her it was a piece of a Delta II-|||-rocket that had been used to-|||-launch a satellite.-|||-2 Many countries around the-|||-world have sent satellites into-|||-space.We need satellites to-|||-send and receive TV and radio-|||-signals,to report the weather-|||-and for many other things.But when they become old or they break down or we don`t-|||-need them any more,we just leave them there.They become space junk.-|||-Scientists think there are about 1616,000 objects larger than 10 centimeters wide flying 20-|||-around the Earth,and tens of millions of smaller objects too.They travel at around-|||-7 kilometers a second.That`s fast!And it`s their speed that makes these pieces of space-|||-junk really dangerous.If one small piece of space junk hits something at high speed,it-|||-can do a lot of damage.Luckily,there haven`t been many collisions.But in 2009,an-|||-old Russian satellite hit and destroyed an American satellite-and that created 2,000-|||-new pieces of space junk!-|||-Pieces of space junk re-enter the Earth`s atmosphere every day.But Lottie Williams-|||-is the only person who has been hit.The piece that hit her was light,and the air in the-|||-atmosphere had slowed it down.Most space junk burns up and doesn`t reach the-|||-Earth`s surface.But in 2011,a metal ball 35 centimeters wide fell to Earth in-|||-Namibia,Africa.It made a hole in the ground 30 centimeters deep and over 3 meters-|||-wide.Lottie was lucky she wasn`t hit by that!pp ac e nk-|||-太空垃圾-|||-1 In 1997 Lottie Williams was-|||-walking through a park in-|||-Oklahoma,in the US,with her-|||-friends.Suddenly somethin-|||-tapped her on the shoulder-|||-and fell to the ground.She-|||-picked the object up.It was-|||-about as heavy as an empty-|||-soda can.Later,scientists told-|||-her it was a piece of a Delta II-|||-rocket that had been used to-|||-launch a satellite.-|||-2 Many countries around the-|||-world have sent satellites into-|||-space.We need satellites to-|||-send and receive TV and radio-|||-signals,to report the weather-|||-and for many other things.But when they become old or they break down or we don`t-|||-need them any more,we just leave them there.They become space junk.-|||-Scientists think there are about 1616,000 objects larger than 10 centimeters wide flying 20-|||-around the Earth,and tens of millions of smaller objects too.They travel at around-|||-7 kilometers a second.That`s fast!And it`s their speed that makes these pieces of space-|||-junk really dangerous.If one small piece of space junk hits something at high speed,it-|||-can do a lot of damage.Luckily,there haven`t been many collisions.But in 2009,an-|||-old Russian satellite hit and destroyed an American satellite-and that created 2,000-|||-new pieces of space junk!-|||-Pieces of space junk re-enter the Earth`s atmosphere every day.But Lottie Williams-|||-is the only person who has been hit.The piece that hit her was light,and the air in the-|||-atmosphere had slowed it down.Most space junk burns up and doesn`t reach the-|||-Earth`s surface.But in 2011,a metal ball 35 centimeters wide fell to Earth in-|||-Namibia,Africa.It made a hole in the ground 30 centimeters deep and over 3 meters-|||-wide.Lottie was lucky she wasn`t hit by that!