Rocket will collide with the moon tomorrow. Here's what you need to know.

A discarded rocket stage will hit the moon Friday at a speed of 9,288 km/h. Everything you need to know is here.

The space junk is expected to hit a crater on the far side of the moon at 7:25 a.m. Friday.

What is it?

The upper stage of the rocket was thrown away. Bill Gray, a U.S. astronomer and the developer of the asteroid - tracking software Project Pluto, has been watching it since it was first detected in March 2015.

Gray first thought the debris was from a rocket that was sent to space in February 2015, but more recent evidence shows it to be the upper stage of a rocket from China. Live Science reported that Chinese foreign ministry officials disagreed with the idea.

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The impact will be impossible to view using Earthbound telescopes because it will take place on the far side of the moon. The crater may be visible in the next few weeks or months. Satellites that are in the vicinity of the moon may not be in the right spot to capture the collision, but they will eventually be able to identify the object.

Will it damage the moon?

The junk's impact won't cause any significant damage to the moon beyond adding another crater. The impactor on the moon will be shattered into pieces by a shock wave when the rocket strikes it. A second shock wave will travel into the moon's dusty upper surface, heating up rocks and dust enough to produce an enormous flash while sending a huge cloud of material hundreds of miles high. The New York Times reported that the crater caused by the rocket will be between 10 and 20 meters in diameter.

This is the first time a human-made satellite has crashed into the moon. In 2009, NASA fired its lunar observatory into the south pole at 5,600 mph, unleashing a jet of material that enabled scientists to detect the key signatures of water ice. The rockets used for the Apollo missions were fired into the moon.

What could scientists learn from it?

There are two reasons scientists are excited to look at the new crater.

Because we know the speed and size of the object smashing into the moon's surface, researchers hope that the size of the dent caused by the impactor could provide a useful yardstick for judging other craters on the moon.

Scientists hope that the impact will give them a better understanding of the moon's subsurface, because they know very little about it.

It was originally published on Live Science.