During nuclear fusion on a protostar, ____________ atoms fuse to ...

[Deast7027]

During nuclear fusion on a protostar, ____________ atoms fuse to form helium atoms. Fill in the blank(s) with the appropriate word(s).

Question 2

A(n) ____________ is a huge, rotating aggregation of stars, dust, gas, and other debris held together by gravity. Fill in the blank(s) with the appropriate word(s).

[bob]

Answer to Question 1

hydrogen

Answer to Question 2

galaxy

[Deast7027]

Thanks for the timely response, appreciate it

[jackie]

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