The Voyager 1 space probe was launched in 1977. It took 35 years for the probe to leave our solar system. It is now nearly twice the distance from Pluto to the Sun (about 12 billion miles). It is one of the fastest objects scientists and engineers have made, traveling at about 61,000 km/hr. At this velocity, it will take nearly 40,000 years before Voyager 1 makes its nearest approach to another star (9.3 trillion miles). Based on this data, which statement best summarizes the size and scale of the solar system and Earth's stellar neighborhood? The most distant objects in the solar system are stars. The distances between the planets in the solar system are larger than the distances between stars. The solar system is much larger than stars outside the solar system. The distances between stars is extremely large compared to the distances within the solar system.

a.   mass number from atomic number

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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