If they have planets, of couse. And if you could intercept and move on to one of those planets, you could observe a much longer chunk of time go by in the rest of the universe. That would be fascinating for any astronomer.
At a third of the speed of light your time dilation would only give you a 5% increase in your time duration. So, not so fascinating. You'd be better off increasing your life span by becoming a eunuch (13.5 extra years of life) - well, maybe on second thoughts you might not be better off after all