Black Hole Model

Hello! In this instructable I will teach you how you can make your own black hole model ! The main aim of this project is to help you understand how black holes really work. Many people think that black holes are really 'holes' in space. By building this model, people will gain a clear concept that black holes are just the dense cores of massive stars. They appear black because light can't escape from a black hole. So, without any further delay let's dive into it :D

• Cylindrical-plastic-transparent container Plastic container
• BO motor (single shaft) Single shaft BO motor
• Propeller ( Must fit inside the container)
• Thin rod for connecting the motor to the propeller (You might find one attached to gears in toys) connecting rod
• Sheet of paper
• Super glue
• Ping pong ball
• Black fabric paint
• Oil pastel
• Mechanix connectors with screws mechanix connectors
• DC adapter / battery (suggested : 12V)
• Soldering iron

Here we can see that a transparent - plastic container has been attached to the base of the whole setup. On the base is a BO motor and the end of the axis has been attached to a propeller using a small and thin rod. The propeller is inside the plastic container and near the base of the container. The container is filled with water to a certain height. The ping pong ball is placed at the centre of the whirlpool.

• mark the centre of the base of the container
• make a hole at the centre. The hole should be as wide as the rod which connects the propeller and the motor. If the
hole is too wide, water will leak from the container. Make a hole such that the rod barely passes through it. Later, apply grease to the hole to reduce friction.
• connect the motor to the propeller using the connecting rod.
• connect the motor to a simple switch circuit. I have used 12V for powering up the motor.
• measure the height H between the base of the container and the base of the BO motor.

• the base of the model should be of any shape and greater than the area of the base of the container. The base should be heavier than the container.
• before attaching the connectors to the base, plan how you are going to attach it.
• glue the base of the motor to the base of the setup.
• attach 3 to 4 connectors to the base of the setup.
• you may make holes for screws using soldering iron.
• attach the connectors using screws to the lower curved surface of the container. make sure that the height between the base of the container and the base of the setup is H (see previous step)

• take a sheet of paper having the same curved surface area of the transparent container.
• colour it using black pastel
• make holes in the sheet for the stars.
• wrap the sheet around the container

At the end of the project, turn off the lights and use a torch to make the stars glow !

• Pour water in the container upto a height which is a few centimeters less than the brim of the container.
• Paint the ping pong ball using black fabric colour.
• Turn on the BO motor and eventually a vortex will be created.
• place the ball carefully at the centre of the vortex.
• You may decorate the model as per your choice

• You will be able to detach the container from the base of the model by just loosening the screws of the connectors
• If water leaks from the hole at the base of the container, try to stop the water leakage using a sponge / oil .
• always be careful while doing the project as there is electricity and water involved. Thus, don't electrocute yourself !

Thank you for viewing this project ! I hope that now you will be able to make your own black hole model.