Okay, so if the Earth were the size of a golf ball, Canis Majoris would be the height of Mount Everest; that means you could fit 7 quadrillion Earths inside of Canis Majoris, that's enough golf balls to fill up the state of Texas 22 inches deep. Just so you know, 1 million seconds ago is 12 days ago, 1 billion seconds ago is 1975, 1 trillion seconds ago is 29,700 BC but the Earth was not even around yet then. Now are you ready for this? 1 quadrillion seconds ago is 30,800,000 years ago so I am going to say Canis Majoris is pretty big.