Thank you to grantcart for the above quote.
I'm not going to say that space may be a battle ground someday, knowing the nature of some parts of our species - it is a given. Wish it weren't so.
I will also suppose that was an argument against the exploration of the high seas back in the day.
Here is a list, small and incomplete of what we have gained by space exploration. Things we take for granted, some we may not want to live without.
Consumer/Home/Recreation - NASA Spinoffs
ENRICHED BABY FOOD - A microalgae-based, vegetable-like oil called Formulaid developed from NASA-sponsored research on long duration space travel, contains two essential fatty acids found in human milk but not in most baby formulas, believed to be important for infants' mental and visual development.
WATER PURIFICATION SYSTEM - NASA-developed municipal-size water treatment system for developing nations, called the Regenerable Biocide Delivery Unit, uses iodine rather than chlorine to kill bacteria.
SCRATCH-RESISTANT LENSES - A modified version of a dual ion beam bonding process developed by NASA involves coating the lenses with a film of diamond-like carbon that not only provides scratch resistance, but also decreases surface friction, reducing water spots.
POOL PURIFICATION - Space technology designed to sterilize water on long-duration spacecraft applied to swimming pool purification led to a system that uses two silver-copper alloy electrodes that generate silver and copper ions when an electric current passes through them to kill bacteria and algae without chemicals.
RIBBED SWIMSUIT - NASA-developed riblets applied to competition swimsuits resulted in flume testing of 10 to 15 percent faster speeds than any other world class swim-suit due to the small, barely visible grooves that reduce friction and aerodynamic drag by modifying the turbulent airflow next to the skin.
GOLF BALL AERODYNAMICS - A recently designed golf ball, which has 500 dimples arranged in a pattern of 60 spherical triangles, employs NASA aerodynamics technology to create a more symmetrical ball surface, sustaining initial velocity longer and producing a more stable ball flight for better accuracy and distance.
PORTABLE COOLERS/WARMERS - Based on a NASA-inspired space cooling system employing thermoelectric technology, the portable cooler/warmer plugs into the cigarette lighters of autos, recreational vehicles, boats, or motel outlets. Utilizes one or two miniaturized modules delivering the cooling power of a 10-pound block of ice and the heating power of up to 125 degrees Fahrenheit.
SPORTS TRAINING - Space-developed cardio-muscular conditioner helps athletes increase muscular strength and cardiovascular fitness through kinetic exercise.
ATHLETIC SHOES - Moon Boot material encapsulated in running shoe midsoles improve shock absorption and provides superior stability and motion control.
Other spinoffs in this area include: Dustbuster, shock-absorbing helmets, home security systems, smoke detectors, flat panel televisions, high-density batteries, trash compactors, food packaging and freeze-dried technology, cool sportswear, sports bras, hair styling appliances, fogless ski goggles, self-adjusting sunglasses, composite golf clubs, hang gliders, art preservation, and quartz crystal timing equipment.
These are just things that most of us can relate to on a daily basis. Here are some other categories;
1. Computer Technology
2. Consumer/Home/Recreation
3. Environmental and Resource Management
4. Health and Medicine
5. Industrial Productivity/Manufacturing Technology
6. Public Safety
7. Transportation
Below is the link to the info, please read. There are more sites, I chose one that is not a NASA site, thought it would be more palatable to some.
http://www.thespaceplace.com/nasa/spinoffs.html#Top