Remember when Elon Musk launched a car into space? That car's not just peacefully drifting through a vacuum—it's hurtling around the sun at 63,592 miles per hour, being bombarded by solar radiation. It might be in pieces, but these are not the same pieces it would be in if it were down here on Earth. That's because the environment in space breaks down materials differently.

But how long does it take to break down, and how is that car looking right about now?

In the past week alone, we've seen two separate incidents of space debris hurtling back to Earth in unexpected places.

On Saturday there was the uncontrolled re-entry of a Chinese Long March 5B rocket over Malaysia. Yesterday outlets reported on some spacecraft parts that turned up in regional New South Wales—now confirmed to be from a SpaceX Crew-1 mission.

As the space industry grows, it's safe to say such incidents will only become more frequent—and they could pose a risk. But how much of a risk, exactly?

Chunks of metal hurtling towards us

Space debris refers to the leftover components of a space system that are no longer required. It might be a satellite that has reached the end of its life (such as the International Space Station), or parts of a rocket system that have fulfilled their purpose and are discarded.

To date, China has launched three Long March 5B rockets, and each has been deliberately left in an uncontrolled orbit.

The third time really was the charm for Dude Perfect co-founder Coby Cotton.

Cotton and the four other founding members of the Frisco-based sports and entertainment company had their third model rocket competition at the start of July, and Cotton had lost the previous two. The only thing on the line during those competitions was a golden rocket trophy. This time, the prize was a trip to space.

Cotton's rocket soared 7,412 feet in the air, past all of the other competitors' rockets but nowhere near as high as he will be aboard the next Blue Origin rocket on his way to space. He will be a crew member on New Shepard's 22nd flight, which blasts off Thursday.

Cotton started the Dude Perfect YouTube channel with his twin brother and three of their college friends in 2009, after a video of them doing backyard basketball trick shots went viral. It has since grown to become the fourth-biggest sports channel on YouTube.

Amazon founder Jeff Bezos founded Blue Origin in 2000, with the mission of making it possible for millions of people to live and work in space.