Rockets go up, traditionally, and not sideways – although backyard bottle rockets on the Fourth of July often ignore this tradition. When it comes to big-boy rockets, like the ones that go into orbit, we almost always launch them from the ground. But actually, it's entirely possible to launch orbital rockets sideways from aircraft at high altitude. In fact, NASA just air-launched its Orbital ATK Pegasus XL rocket this way.
So why don't we launch more rockets in this fashion? Well, the air-launch technique has its advantages. Pilots can fly up and over any bad weather, and the thinner air at high altitudes makes for reduced friction. But horizontal launches can be more expensive and they can't carry as much weight. Trace Dominguez breaks down the rocket science in today's DNews report.
NPR: NASA Rocket Deploys 'Satellite Constellation' After Unique Air-Launch
NASA: NASA Armstrong Fact Sheet: X-15 Hypersonic Research Program
Orbital ATK: Pegasus