the sun has the average mass of all the stars, then divide the mass of the galaxy by the mass of the sun.
Specifically, she wants you to do this division by subtracting exponents. 10^30 has 30 zeroes after it. 10^42 has 42 zeroes. That's a difference of 12 zeroes, which is a trillion stars.
That's approximately right, but since the sun is not exactly the average size, the real answer is about 1/3 that, 300 billion
Just assume that the sun has the average mass of all the stars Then divide the mass of the galaxy by the mass of the sun. <span>10^30 has 30 zeroes after it. 10^42 has 42 zeroes.
The answer would have 12 zeroes which concludes a trillion stars. </span>
When water vapor in the air comes into contact with something cool, like the ceiling of a tent, its molecules slow down and get closer together. When that happens, the gaseous water vapor turns back into liquid water droplets. That's condensation!
A coefficient is a number placed in front of a chemical symbol or formula that shows how many atoms or molecules of the substance are involved in the reaction.
