Geography, 21.08.2019 00:30 kimberly01262016
It’s possible to make a rough estimate of how often planetary systems form by making some basic assumptions. for example, if you assume that the stars we see have been born at random times over the last 10 billion years, then the rate of star formation is simply the number of stars we see divided by 10 billion years. the fraction of stars with detected extrasolar planets is at least 5 %, so this factor can be multiplied in to find the approximate rate of formation of planetary systems.
a) using these assumptions, how often does a planetary system form in our galaxy? (our galaxy contains at least 100 billion stars.)
b) how often does a planetary system form somewhere in the observable universe, which contains at least 100 billion galaxies? (express in seconds)
Answers: 3
Geography, 23.06.2019 11:10
Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks
Answers: 2
Geography, 23.06.2019 15:00
Can someone answer all these questions i need it done by tonight. once again
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Geography, 23.06.2019 16:20
Which barrier to economic development is shown in the following examples?
Answers: 1
It’s possible to make a rough estimate of how often planetary systems form by making some basic assu...
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