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.
Here are what I consider to be the key factors in hamburger perfection. 1  Choose the right meat. Here's a newsflash, fat tastes good! 2  Use high heat and cook them fast! Like most thin meat products, it's best to apply high and direct heat to your hamburger and cook it as fast as possible. 3  Be gentle with that meat!