With high-altitude balloons and aircraft, one can get above even more of the atmosphere.

High-altitude balloons can carry scientific instruments above 99.7 percent of the atmosphere.

In 2012, the advanced engineering class launched and recovered a high-altitude balloon.

High-altitude balloons have also been used to place cameras and other equipment into what is termed "near space".

Since 1974, more than 500 high-altitude balloons have been launched from Esrange for research purposes.

In 1896 made the first in a series of several high-altitude balloon ascents.

Gamma rays in space have been examined from high-altitude balloons and smaller spacecraft.

The telescope is launched with a high-altitude balloon to a floating altitude of approximately 40km.

Depends on the vagaries of satellite positions, high-altitude balloons and cloud cover.

These high-altitude balloon flights from 1947-1960 tested radiation exposure, physiological response, life support and recovery systems.

What sets this proposed Venus mission apart is the use of high-altitude balloons to study the planet's upper atmosphere.

He invented clustered high-altitude balloons, and with his wife Jeannette, the plastic balloon.

To the eyes of a civilian witness in the 1950s, a high-altitude balloon recovery with attendant dummies would have seemed very unusual.

Numerous experiments are conducted through high-altitude balloons mounted with scientific equipment, which is used to measure environmental changes or to keep track of weather.

Since gamma rays do not penetrate Earth's atmosphere, they have been studied in recent years by high-altitude balloons and smaller spacecraft.

The Strato-Lab program utilized the new plastic high-altitude balloons for upper atmosphere research.

Greisen did experiments on cosmic ray- and gamma ray-astronomy using high-altitude balloons.

It was designed to be air-launched from a high-altitude balloon, similar to the American Rockoon experiments of the 1950s.

It replaced earlier, frankly propagandistic programs, including mass dropping of anti-Communist leaflets from high-altitude balloons.

So a few years later, survey satellites were placed in permanent orbit, and high-altitude balloons were dropped into the atmosphere to study its wind patterns.

Altitude DCS became a common problem in the 1930s with the development of high-altitude balloon and aircraft flights.

Although manned high-altitude balloon ascensions are still undertaken, they are more likely to be the work of adventurers than researchers.

Late autumn or early spring are the safest seasons for high-altitude balloon flights; Nott will spend the layover replenishing his bank account.

Fire "bullets" of frozen ozone into the atmosphere or place solar-powered ozone generators in high-altitude balloons.

Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches.