“The bottom line answer is that it was too expensive. Way too expensive,” former NASA Jet Propulsion Laboratory system engineer Mark Adler wrote in 2015. “The shuttle never met its promise for low-cost access to space by virtue of the system’s reusability.” What happened to the space shuttle program? TheRead More →

Without gravity, hot air expands but doesn’t move upward. The flame persists because of the diffusion of oxygen, with random oxygen molecules drifting into the fire. Absent the upward flow of hot air, fires in microgravity are dome-shaped or spherical—and sluggish, thanks to meager oxygen flow. Would a lighter workRead More →

Medical Definition of subphrenic space : a space on each side of the falciform ligament between the underside of the diaphragm and the upper side of the liver. What causes subphrenic abscess? Subphrenic abscesses represent infected collections bounded above by the diaphragm, and below by the transverse colon and mesocolon,Read More →

Medium-range ballistic missiles, traveling between 1,000–3,000 kilometers (approximately 620-1,860 miles); Intermediate-range ballistic missiles, traveling between 3,000–5,500 kilometers (approximately 1,860-3,410 miles); and. Intercontinental ballistic missiles (ICBMs), traveling more than 5,500 kilometers. Where are ballistic missiles stored? A missile launch facility, also known as an underground missile silo, launch facility (LF), orRead More →

A gas or oil-powered furnace can be installed in a crawl space as long as the regulations and local codes are adhered to. According to 2407 of the IRC, the location of the appliance should not interfere with the circulation of combustion, ventilation, and dilution of air. What temperature shouldRead More →

In anatomy, the epidural space is the potential space between the two layers of the dura mater (the outermost meningeal layer that covers the brain and spinal cord). Why is there no epidural space in the brain? The epidural space contains blood vessels (veins) and fat. The dura mater surroundingRead More →

The CHAR and VARCHAR types are similar, but differ in the way they are stored and retrieved. They also differ in maximum length and in whether trailing spaces are retained. … For example, CHAR(30) can hold up to 30 characters. The length of a CHAR column is fixed to theRead More →

The pencil wasn’t an ideal choice for writing in space because its tip could flake and break off, drifting in microgravity with the potential to harm an astronaut or an equipment. Legend has it that during the height of the space race in the 1960s, NASA scientists figured that pensRead More →