A space

Stars often form gravitationally bound systems: binary or multiple systems, star clusters and galaxies. Over time, stars change their characteristics, as thermonuclear fusion takes place in their depths, as a result of which the chemical composition and mass change - this phenomenon is called the evolution of stars, and depending on the initial mass of the star, it can take place in completely different ways.

The most common classification scheme for stars - by spectral classes - is based on their temperature and luminosity[⇨]. In addition, variable stars are distinguished among the stars, which change their apparent brightness for various reasons, with their own classification system.

What are 5 facts about space?
NASA has recorded eerie space "sounds." ...
Sunsets on Mars are blue. ...
Launching things into space is wildly expensive. ...
Space is full of "space junk." ...
The Apollo astronauts' footprints on the moon could last up to 100 million years. ...
Space isn't always cold. ...
A year on Venus is shorter than a day there.

What is this space?
Space is a three-dimensional continuum containing positions and directions. In classical physics, physical space is often conceived in three linear dimensions. Modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime.

What is a simple definition of space?
: a boundless three-dimensional extent in which objects and events occur and have relative position and direction.