There’s nothing like trying to calculate how far apart everything is (what an empty place!) when trying to understand just how far apart everything is … Read More

If you’re wondering how anyone could think a trip to the nearest star were possible, well…you don’t have to be an expert in physics to … Read More

Imagine the Earth as a marble. Then imagine crushing that glass globe down to size of a sugar cube. Its mass wouldn’t change by much. … Read More

If you were standing on the Moon’s surface, you’d be looking back at Earth. It is a beautiful blue world suspended in the darkness. It … Read More

When we think about gravitational force of a planet, it’s easy to think of it as basic sphere. Imagine that there’s a transparent bubble and … Read More

When one thinks about a satellite orbiting a planet on a normal orbit, think again: what happens if tidal forces get too high? If gravity … Read More

Your weight is never set in stone. At least not unless you’re on Earth. Weight is simply an indication of the gravitational force acting upon … Read More

Think about the rocket on the pad at that moment. The fueled, cold engines is waiting for command to fire. He is waiting for the … Read More

When propellant is factored in to the math, rocket design goes from being an abstraction to something practical. You realize that each kilo of fuel … Read More

A Rocket thrust calculator takes data from geometry of nozzle and the rate at which propellant flows through it to produce a quantifiable amount of … Read More