DALLASI absolutely love this, it's called an orrery, and it's a little mechanical model of our solar system. You can see the planets here, orbiting the sun as they would do in real life.

An Egyptian astronomer called Ptolemy (AD100-168) described one of the earliest ideas for how the Solar System is structured. Ptolemy’s model and many earlier ideas of the Solar System had the ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

Electrical efficiency Image: University of Manchester, Solar Energy, CC BY 4.0 Scientists created a numerical model to describe the system ... Indonesia. The initial temperature was uniformly ...