The observable Universe is about 13.8 billion years old. It's apparent diameter is around 93 billion light years, and it’s is still expanding.
The Universe is partly made up of an estimated 200 billion Galaxies, each of which can contain billions of Stars.
Baryonic Matter is the stuff that we are made of, it is also the same stuff that makes up the Galaxies, Planets and Moons, everything that we can touch, see and feel, the water we drink and the seas and oceans ,the air that we breath and the food that we eat, also every atom that makes up the particles that exist in the magnetic spectrum.
The eye opener is Baryonic Mater only makes up around 5% of total Mass of the Universe. The rest is made up of 68% dark energy and 27% dark matter.
At this point in time we do not actually know exactly what either dark matter or dark energy is. Click for a better understanding.
Over any given distance there is a time lag. Astrophotography is, in a way, a record of that time lag.
The Andromeda Galaxy is 2.5 million light years away from Earth. My image of the Andromeda Galaxy shows it as it was 2.5 million years ago, not as it may look now. The Moon's average distance is 238,855 miles from Earth, so my image of the Moon records it as it was about 1.3 seconds ago. All astro images are a recorded history of an object's journey through space and time.
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