It's fun to think about how we know stuff. For instance, the sun has a mass of about 2 x 10 30 kilograms. That is such an enormous mass that it's difficult to comprehend. And if it's so difficult for ...

How do we know the mass of a planet originally appeared on Quora - the knowledge sharing network where compelling questions are answered by people with unique insights. Answer by Geoffrey Widdison on ...

Astronomers cannot directly weigh celestial objects like galaxies; indirect methods are necessary. Mass determination leverages the relationship between gravity and mass, utilizing orbital periods and ...

This is a good question, and also a good reminder to be careful with one’s language when writing about physics! Most of the time, if you’re reading an article, what we mean by mass and rest mass is ...

The terms weight and mass are often used incorrectly. Phrases like ‘a bag of sugar weighs 1 kg’ are not scientifically correct. This means that a 1 kg mass would be attracted to Earth by a force of 10 ...

A gram is a standard unit of measurement. It is a word used to describe the mass of an object. You record the mass of light objects in grams. One way to measure the mass of objects is to use balance ...

When you think of space missions, you might think of humans walking on the moon or rovers rolling around on Mars. But there's a whole bunch of other awesome space missions too. One of these events was ...