Nuclear __ occurs naturally on the sun and other stars. fission bombardment fusion half-life

## Step 1<br />The problem is asking us to identify the type of nuclear reaction that naturally occurs on the sun and other stars. The options provided are fission, bombardment, fusion, and half-life.<br /><br />## Step 2<br />We need to understand what each of these terms means in the context of nuclear reactions.<br /><br />### **Nuclear fission** is a process where a large nucleus splits into two smaller ones, releasing a large amount of energy. This process is used in nuclear power plants and atomic bombs.<br /><br />### **Nuclear bombardment** is not a standard term in nuclear physics. It could refer to the process of a nucleus being hit by another particle, but it's not a specific type of nuclear reaction.<br /><br />### **Nuclear fusion** is a process where two small nuclei combine to form a larger nucleus, releasing a large amount of energy. This process is what powers the sun and other stars.<br /><br />### **Half-life** is a term used in nuclear physics to describe the time it takes for half of the atoms in a sample to decay. It's not a type of nuclear reaction.<br /><br />## Step 3<br />Given the context of the problem, we can eliminate fission, bombardment, and half-life as they do not describe the type of nuclear reaction that occurs on the sun and other stars.<br /><br />## Step 4<br />The only option left is fusion, which is the correct answer. The sun and other stars produce their energy through the process of nuclear fusion.