Space, or outer space, is the entire universe that exists beyond the atmosphere of the planet Earth. The observable universe is about 93 billion light-years in diameter. Beyond this, we don't know what is out there. Humans have limited understanding of space whereby many apparent objects in space have been known to us for less than two centuries and our knowledge of them is based on limited data. The following are things that are known to exist or thought to exist in space.
Primordial Black Holes
Warm–Hot Intergalactic Medium
NotesThe list above are all types of things in space with the exception of the Sun and Heliosphere that are examples of specific astronomical objects.
This is the complete list of articles we have written about space.
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An overview of space junk.
The Fermi Paradox explained.
A list of existing, proposed and hypothetical spacecraft.
An overview of piggybacks in transportation.
The common types of orbit.
An overview of the speed of light with examples.
An overview of the space industry with examples.
The definition of inertia with examples.
An overview of the common wavelengths of the electromagnetic spectrum.
A list of the branches of physics.
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