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Tems11 [23]
3 years ago
10

Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals o

f 73 hours the star becomes dimmer for about 2 hours. The most likely explanation is that:________.1. The star is cepheid variable.2. The star is a member of binary eclipsing star system.3. The star is peridically ejecting gas into space every 73 hours.4. The star is a white dwarf.
Social Studies
1 answer:
Bess [88]3 years ago
7 0

Answer: 2

The star is a member of a binary eclipsing star system.

Explanation:

Eclipsing binaries are the main source of determining a star's mass. A binary star system is essentially a system where two stars are orbiting around a common centre of mass. Eclipsing stars are studied by measuring their the changes in their brightness over a specified period of time. Light curves are graphical representation of the variations in stars over a given period of time.

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Answer:

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Explanation:

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In the manufacture of stone implements, four fundamental traditions were developed by the Paleolithic ancestors: (1) pebble-tool traditions; (2) bifacial-tool, or hand-ax, traditions; (3) flake-tool traditions; and (4) blade-tool traditions. Only rarely are any of these found in “pure” form, and this fact has led to mistaken notions in many instances concerning the significance of various assemblages. Indeed, though a certain tradition might be superseded in a given region by a more advanced method of producing tools, the older technique persisted as long as it was needed for a given purpose. In general, however, there is an overall trend in the order as given above, starting with simple pebble tools that have a single edge sharpened for cutting or chopping. But no true pebble-tool horizons had yet, by the late 20th century, been recognized in Europe. In southern and eastern Asia, on the other hand, pebble tools of primitive type continued in use throughout Paleolithic times.

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