Astronomy Unit (Earth Science)

Define light year

A light year is a unit of measurement equal to the distance light travels in one year,i.e, 9.46 time 10 to the power of 12 km.

Define astronomical unit

An Astronomical unit is a unit of measurement equal to the average distance between the Sun and Earth, i.e, about 149,600,000 (1.496 times 10 to the power of 8) km.

Where did the solar system most likely come from?

The solar system most likely comes from the idea that the solar system evolved from such a swirling cloud of dust is called the nebular theory.

Define parsec

A parsec is a unit used in astronomy to describe large distances. One parsec equals 3.26 light-years.

Briefly describe a terrestrial planet

A terrestrial planet is a planet similar in size, composition, and density to the Earth. A planet that consists mainly of rocky material.

Define constellation

Constellation is a grouping of stars in the night sky into a recognizable pattern. Most of the constellations get their name from the Latin translation of one of the ancient Greek star patterns that lies within it. In more recent times, more modern astronomers introduced a number of additional groups, and there are now 88 standard configurations recognized.

What is the nearest spiritual galaxy to us?how far is it?

The nearest spiral galaxy to us is Andromeda galaxy.

How much mass of the sun contain in the solar system?

The sun contains 99% mass in the solar system.

How far is the sun from the earth?

The sun is only 8 light minutes away from the Earth.

Name the terrestrial planets

The terrestrial planets are any of the planets Mercury, Venus, Earth,or Mars.

How many satellites are in the solar system(moons)?

There are 67 satellites (moons) are known in the solar system.

How many planes are in the solar system?

There are 9 planets in the solar system.