Youre the grillmaster at the annual family 4th of July BBQ and youre sweating bullets standing over the grill in the sweltering summer heat. Youre trying to stay cool by pressing a cold beer can on your forehead, but to no avail. You cant go inside because, once again, youre the grillmaster and need to watch the food simmering on your freshly cleaned grill. Your brother-in-law is a university astronomy professor and walks over asking how youre doing. You say, This heat is killing me. I feel hotter than the barbeque! Your science teacher brother-in-law slyly says, Try being an exoplanet. You roll your eyes.