How does scientific notation help astronomers?
What will be an ideal response?
Astronomy is the science of big numbers that are used to describe the Universe.Rather than writing out large numbers, it is more convenient to write them in scientific notation. Scientific notation is nothing more than a simple way to express numbers without writing a great many zeros. For example, in scientific notation, you can write 380,000 as 3.8 × 105.
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How do we know that quasars are very distant objects?
A) from their high luminosities B) from the fact that they can vary in luminosity in short time periods C) by observing Cepheid variables within them D) from their large redshifts E) by measuring their parallax angles
On what date/s does the Sun rise exactly due east and set exactly due west?
A. only on June 21 B. only on March 21 C. March 21 and September 22 D. June 21 and December 21
Ptolemy's Cosmos..
a) was geocentric with planets moving in epicycles along deferents and was the culmination of early Greek philosophy b) was the first record of an heliocentric cosmos c) was geocentric with planets exhibiting only prograde d) flat with water surrounding ut like a moat
A fishing-boat captain returns to port saying, "It's rough out there with waves that are 4 meters high." He is probably talking of waves of amplitude
A) 1 m. B) 2 m. C) 3 m. D) 4 m.