Forces

What is the Sun?





Make Your Own Impact Crater

Impact craters are made when a space rock (called a meteorite or asteroid) hits a rocky planet or moon. The impact makes a round hole in the surface, called a crater.



Photo of the Barringer Meteor Crater in Arizona


How Do Satellites Stay In Orbit?

A satellite is an object which orbits another. An orbit is the curved path that an object in space takes around another object.



A satellite in space with part of the Earth below it. The satellite is surrounded by question marks,


How is the Universe Expanding?



Illustration representing the mesh used to describe gravity.


What Can We See on the Sun?



Close up images of the Sun including solar flares, sunspots, and a solar eclipse


Kepler's Laws: Find the Mass of the Sun

Many years ago, a mathematician named Johannes Kepler created a set of rules explaining planets' movement in our Solar System.



The picture shows a cartoon portrait of Johannes Kepler in front of an artist's impression of the Solar System.


What Is Kepler's Third Law?



This is a cartoon image of Johannes Kepler and Isaac Newton with a parchment-like background. A diagram of a planet's orbit is featured in the middle behind the figures. To the right of the figures, is a cartoon of an apple falling.


What Is Kepler's Second Law?



This is a cartoon image of Johannes Kepler with a parchment-like background. A diagram of a planet's orbit is featured in the top right corner.


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