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.
Grill the patties for three to five minutes per side, depending on how well done you want the burgers. Grill the burgers with the lid open. To make cheeseburgers, place a slice of cheese on top of each patty and close the lid for the last two minutes of cooking time. Check the burgers for doneness with an internal meat thermometer. Pull the burgers from the grill when the internal temperature reaches 155 degrees Fahrenheit for medium burgers.