The centers of galaxies have yielded few of their secrets because they are obscured by dust and gas, although this is beginning to change with the advent of space-based observations.

Once space-based observation became possible via satellites and probes, it was shown to hold no such object.

Measurements of near-Earth orbital debris are accomplished by conducting ground-based and space-based observations of the orbital debris environment.

The seven Nimbus satellites, launched over a fourteen-year period, shared their space-based observations of the planet for thirty years.

Since 1980, when regular space-based observations of noctilucent clouds began, their number has increased about 28 percent per decade, and they are reflecting more light, because the ice crystals are bigger.

Hildebrand will discuss and illustrate space-based observations of these global phenomena and the consequences for human society.

NASA continues to enhance the ability of the international scientific community to advance global integrated Earth system science using space-based observations.

Perturbations and interference from the earth's atmosphere make space-based observations necessary for infrared, ultraviolet, gamma-ray, and X-ray astronomy.

The amenability of fluorescence to remote, even space-based observation qualifies it to join the emerging suite of space-based technologies for Earth observation.

It has advanced the cause of science: for example, cosmology, and with it our understanding of basic physics, has made huge strides through space-based observation.