Is there another planet that is stable for life

What causes the displays of lights called auroras?

Does time machine really exist?

A boy and his skateboard have a combined mass of 65KG what is the speed of the boy and skateboard if they have a momentum of 275 KG times M/s

An object that's charged has more electrons than protons. an object that's charged has fewer electrons than protons. an object that's charged has the same number of electrons and protons.

The universal law of gravitation states that the force of attraction between two objects depends on which quantities?

Which is a result of using a machine? The amount of work that is done is increased. The work input is less than the work output. Both the force and the distance through which it acts increase.

What is the difference between electromagnet and electromagnetism?

Which of the following can be determined by studying the spectrum of a star? the chemicals in the atmosphere of the star the motion of the star the temperature of the atmosphere of the star all of the above

How do I find the specific heat of an object?

In order to be considered scientific, evidence must be: