Heliosphere.
If you were to break down the word
you’d have helio meaning Sun
and sphere meaning, well spherical.
The heliosphere is basically
a big bubble created by the Sun
that surrounds the planets in our solar system.
Think of the Sun as a huge fan,
except instead of normal wind,
it’s blowing a mixture of charged particles
away from the Sun, known as solar wind.
And these can reach speeds of 300km/s to up to 700 km/s.
The heliosphere is all the region
affected by this solar wind.
The outer boundary of the heliosphere
is where the solar wind merges with
the particles of deep space.
The heliosphere is our neighborhood in space,
and it’s also the habitat
in which our solar system evolved,
so studying the heliosphere
allows us to understand
what makes planets like Earth habitable,
and what the rest of the universe might look like.