Question: Recently scientists have found approx 7-billion-year-old presolar grains of Silicon Carbide (SiC) in which of the following countries?
(a) Australia
(b) USA
(c) Canada
(d) Brazil
Answer: (a)
Related facts:
- Recently, scientists have found 4.6 to 7-billion-year-old presolar grains of Silicon Carbide (SiC) in the Murchison meteorite which fell in Australia in 1969.
- The presolar grains of Silicon Carbide are the oldest solid materials ever found.
- These grains are formed before the solar system’s formation and thus termed as “presolar grains”.
- The presolar grains are very rare, found only in about 5% of meteorites that have fallen to Earth.
- It may reveal the phenomenon of formation of stars in the Milky Way Galaxy. As the presence of Silicon Carbide in the meteorite are samples of stardust.
- It also provides clues about the rate of star formation in the Milky Way galaxy.
Link:
http://www.sci-news.com/space/stardust-murchison-meteorite-08009.html