<u>Answer:</u>
Great amounts of energy are released in the core of a star as lighter elements combine and form heavier elements during the process of nuclear fusion.
<u>Explanation:</u>
- Nuclear fusion is the defined as the fusion or combination of many lighter elements to form heavier element.
- Example: Two hydrogen nuclei combine or fuse to form a helium. The greatest amount of energy in star is its hydrogen which gets exhausted consequently resulting in burning of helium and forming heavier elements.
A control variable is a scientific experiment in which the experimental element is unchanged throughout the experiment
a control group is a group in an experiment that does not receive the treatment by the researchers (untouched by them) and used to see the changes between the controlled group and that of the group that received the vial
hope this helps
They are less brighter because of the lesser amount of heat in them. In fact, sunspots are identified as areas that don't subject to heat very much, and are shown as dark spots because it's not hot enough to glow the yellowish orange color we usually see
Hope this helped!
Thanks!
~Steve