Question

answer. wrong answer will be reported​

Answer 1

Answer:

1) The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.

2) Nicolaus Copernicus

By the 16th century, this model was gradually superseded by the heliocentric model of the universe, as espoused by Copernicus, and then Galileo and Kepler. The Copernican (Heliocentric) Model: In the 16th century, Nicolaus Copernicus began devising his version of the heliocentric model.

3) A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

4) Moon

5) The eight phases of the Moon in order are:

new Moon

waxing crescent Moon

first quarter Moon

waxing gibbous Moon

full Moon

waning gibbous Moon

last quarter Moon

waning crescent Moon.

Answer 2

1. the amount of distance that light travels in one year in free space is termed as a light year. it is calculated to $2.99792458 * 10^8 m/s$.

for calculations it is taken as $3 *10^8 m/s$

2. nicolas copernicus gave the heliocentric theory f the solar system. this theory is also called as copernican heliocentrisim

3. planets are huge spherical giants that revolve around the sun in their own definite, elliptical orbits. they are either made of rock or made up of rocks(less)  and gas(high).

4. Moon is the earth's natural satellite.

5. a) new moon  b) waxing crescent  c) first quarter.  d) waning gibbous

   e) full moon     f) waning gibbous  g) last quarter  h) waning crescent

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