Dating neutron lv
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Neutron star collisions are expected to emit bright jets of material, creating X-rays that fade quickly.
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Without a knowledge of astronomical distances, the size of an observed object in space would remain nothing more than an angular diameter and the brightness of a star could not be converted into its true radiated power, or luminosity.
Astronomical distance measurement began with a knowledge of Earth’s diameter, which provided a base for triangulation.
In the future, space missions may return surface materials from Mars, or other objects, but much of astronomy appears otherwise confined to Earth-based observations augmented by observations from orbiting satellites and long-range space probes and supplemented by theory.