Categories
Physics & Astronomy

How do we know how much stars weigh?

Note:  I decided to take a short break from our story about the genetic code:  to be honest, I’m a little biology-ed out right now.  Don’t worry; I won’t leave you hanging for too long.

Categories
Physics & Astronomy

How do we know that there are planets orbiting other stars?

Thus there is not merely one world, one earth, one sun, but as many worlds as we see bright lights around us…” 

Categories
Physics & Astronomy

How do we know that Voyager 1 has left the Solar System?

This “Family Portrait” of the Solar System was taken on February 14, 1990 by Voyager 1 at a distance of 3.7 billion miles from Earth. Source: NASA/JPL.