X-ray observations are crucial for understanding the structure and evolution of the stars, galaxies, and the Universe as a whole.

Previous solar soft X-ray observations, such as those of Skylab, had been restricted to film as a readout device.

Within a week, I was settled behind a computer, building databases of X-ray observations.

The new findings from X-ray observations were reported here today at a meeting of the American Astronomical Society.

To reduce the search field, the astronomers decided to look at X-ray observations of the area in the constellation Gemini where Geminga lies.

Battery failure in July 1984 caused the operation to become limited, and continuing problems lead to the termination of X-ray observation in 1985.

But an alternative fate was suggested by X-ray observations of two oddly small stars.

Basic X-ray observations were attained by 1960 using such rockets.

It was lost on 14 December 2001 due to battery failure but revolutionised X-ray observations in its decade of operations.

X-ray observations cannot be performed from ground-based telescopes, since Earth's atmosphere blocks most of the incoming radiation.