Artillery ammunition is designed for use in guns, howitzers, and mortars. Size designations for artillery ammunition range from 37MM through 280MM. Artillery ammunition can be classified according to weapon system (gun, howitzer, mortar), filler composition (explosive or chemical), and military use (practice or service). The diameter, or interior, of a …

Two out of three missions to the red planet have failed. One reason there have been so many losses is that there have been so many attempts. “Mars is a favorite target,” says Dr. Firouz Naderi, manager of the Mars Program Office at the Jet Propulsion Laboratory. To get there, …

A new  power revolution is going on in orbit – that of electrical propulsion for satellites. An ion thruster is a form of electric propulsion used for spacecraft propulsion. It creates thrust by accelerating ions with electricity. As the ionised particles escape from the aircraft, they generate a force moving …