After setting a variable using a variable, changing the first variable also changes second? [duplicate]

Firstly know that I am pretty new to Javascript. I am wondering why when I run this script I can successfully set newVar to my modified baseVar, but if I reuse the same baseVar variable it will also change newVar, despite not changing newVar iteself.

var newVar = 0; var baseVar = {number: 0,}; function generateNumber() { var number = Math.round(Math.random() * 50); baseVar.number = number; console.log(baseVar); } generateNumber(); newVar = baseVar; console.log(newVar); generateNumber(); console.log(newVar); 

If I run my function twice, the first time number is 2, and the second time number is 37, I expect my output to read...

[object Object] { number: 2 } [object Object] { number: 2 } [object Object] { number: 37 } [object Object] { number: 2 } 

But what I get is...

[object Object] { number: 2 } [object Object] { number: 2 } [object Object] { number: 37 } [object Object] { number: 37 }