A Mercury-bound spacecraft launched from Earth must travel over 91 million kilometres (57 million miles) into the Sun's gravitational potential well. Mercury has an orbital speed of 48 km/s (30 mi/s), whereas Earth's orbital speed is 30 km/s (19 mi/s).
The interior of a raw hamburger usually does contain bacteria, and is safest if cooked well done.. Because E. coli is killed at 155 degrees Fahrenheit, the USDA sets the minimum safe temperature for ground beef at 160 degrees Fahrenheit.
Using a spatula, transfer the hamburgers to the roasting rack in the oven and continue cooking to desired doneness, 8 to 9 minutes for medium-rare, 10 to 11 minutes for medium, and 13 to 15 minutes for well-done. If you are using the cheese, top the hamburgers during their last couple of minutes of cooking to melt.