Deep space is the region of space beyond the influence of the Sun's gravity.
It is a vast and largely unexplored region, and it is home to a wide variety
of objects, including stars, planets, galaxies, and nebulae.
The boundary between the Solar System and deep space is not well-defined,
but it is generally considered to be the distance at which the Sun's gravity is no longer dominant.
This distance is called the heliopause, and it is estimated
to be about 120 astronomical units (AU) from the Sun.
Deep space is a very hostile environment. The temperatures are extreme,
the radiation levels are high, and there is no air to breathe.
However, there are also many interesting things to see and study in deep space.