When I was reading about the hydrogen spectrum , I came across the statement; > Only Balmer series of hydrogen spectrum can be visible to our eyes. I really got surprised how only Balmer series can be visible to our eyes. However I can agree this because of the *abundance of hydrogen in the universe* Then I got a question , **Why can't other hydrogen spectrum line can't be visible ?** Though other line are also in this universe. Kindly help me to find the logic out. Thank you for spending your valuable time.