
Throughout its lifetime, our galaxy has been kidnapping stars from hundreds of smaller galaxies. In the process, the stars that have been thus stripped away form long streams that follow the orbit of their parent satellite galaxy around the Milky Way. These stellar débris have been dubbed tidal streams and their study provides a new means of weighing the dark matter that envelops our galaxy. Understanding the nature of this type of matter is the principal challenge facingCzech researcher Pavel Kroupa of the Argelander Astronomical Institute (Germany), who is prepared, if necessary to
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