Glossary.

It will be updated after every 10 chapters.

Distance : Due to enormity of Universe astronomers usually use these distances.

1) Parsecs : One parsec is approximately 3.26 light-years.

2) Light Years : A unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).

3) Kiloparsec : 1000 Parsecs.

4) GigaParsecs : One gigaparsec is one billion parsecs — one of the largest units of length commonly used. One gigaparsec is about 3.26 billion light-years, or roughly 114 of the distance to the horizon of the observable universe.

Time :https://en.m.wikipedia.org/wiki/Unit_of_time

Question is whether to keep using light years and kilometers or actual terms. Although scientific terms sound extremely odd. Eg: he travelled a parsec in a sec..

Weird.