Dust from outer space

Article Abstract:

Highly sensitive detectors aboard the Ulysses spacecraft have detected the presence of interstellar grain within Jupiter's orbit. The grains move around retrograde paths at speeds above that necessary to escape the Solar System. These observations showed that the material is indeed interstellar. Observations also detected periodic ejections of some grains from the Jupiter system. This finding may be explained by Jupiter's radial electric field which may repel positively-charged particles with specific charge-to-mass ratios at speeds well over 10 kilometers per second.

Observations, Discovery and exploration, Outer space, Space exploration, Identification and classification, Jupiter (Planet), Cosmic dust

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Carl Sagan (1934-96): astronomer and popularizer of science

Article Abstract:

Renowned astronomer Carl Sagan has finally succumbed to the bone marrow disease myelodysplasia on Dec. 20, 1996. Although he was trained in physics, genetics, astronomy and the humanities, much of his work revolved around his passionate interest in the possibility of extraterrestrial life. Sagan was actively involved in the exploration of the Solar System and has helped to popularize science. His books, television series and newspaper columns had large followings.

Obituary, Astronomers, Sagan, Carl

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Double trouble

Article Abstract:

The Kuiper belt of Neptune is home to around 100,000 frozen bodies- Kuiper belt objects (KBO), each more than 200 kilometers across. It is believed that the KBOs were formed in the early Solar System through the agglomeration of smaller bodies, but however, their origins are not yet confirmed.

United States, Science & research, Research, Solar system, Kuiper Belt

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