1. The document discusses the similarities between atomic and astronomical levels, noting how electrons orbit nuclei like planets orbit stars and both spin on their axes. It also notes spherical shapes are common at both levels. 2. It then discusses Avogadro's constant of 6.022140857(74) ×1023 mol−1, which relates microscopic and macroscopic observations and establishes relationships between physical constants. 3. Based on the similarities observed, the author postulates that there are exactly 6.022140857(74) ×1023 stars in the universe, equivalent to 1 mole of stars.

1. “1 Universe = 1 Mole”
What I learnt from books and daily observation is Nature tries its best to keep things simple (you
kidding me) by providing a pattern so we can (try to) understand it. Over the time, human also
has learnt tremendously (but may be still very little) about nature and its properties. So far, we
have detected the presence of a tiniest quarks particle (10-19
m) to biggest galaxy, IC 1101 (6
billion light years).
There is a so much undeniable similarity between atomic and astronomical level. Few examples:
Electrons rotate around the nucleus, the same way planets rotate around their stars.
Electrons, nucleus and all other subatomic particles spin on their axis, like all other astronomical
particles do on their axis.
From a nucleus to a water droplet to a planet, all have (almost) spherical shape.
A nucleus is the power source of an atom and keeps it intact. In the same manner, a star keeps its
solar system intact. All other micro or macro particles just rotate around its nucleus.
Today, sitting next to this swimming pool on a beautiful summer night and thinking about
chemistry (Yeah, I do that sometime), a particular number struck my brain so hard. This number
is, as we all know it, Avogadro’s number = 6.022140857(74) ×1023
mol−1
.

2. General role in science [from wikipidia]
Avogadro's constant is a fundamental concept in chemistry and physics. It’s a scaling factor
between macroscopic and microscopic (atomic scale) observations of nature. As such, it provides
the relation between other physical constants and properties. For example, it establishes a
relationship between the gas constant R and the Boltzmann constant kB,
R = kB NA = 8.314 Jmol-1
K-1
and the Faraday constant F and the elementary charge e,
F = NAe = 96485.3365 Cmol-1
The Avogadro constant also enters into the definition of the unified atomic mass unit, u,
1 u = Mu/ NA = 1.660,538,921(73) x 10-27
kg
where Mu is the molar mass constant.
Today, this number, 6.022140857(74) ×1023
, feels so magical. No matter what the physical state
of the matter is, this number is always there.
1 gram or 1 mole of Hydrogen has 6.023 x 1023
atoms.
12 grams or 1 mole of Carbon has 6.023 x 1023
atoms.
55.84 grams or 1 mole of Iron has 6.023 x 1023
atoms, and so on. Why 18 grams, 1 mole of water
has 6.023 x 1023
molecules, why not 8.023 x 1025
molecules or something else?
I read at many places over scientific websites, journals, articles, that the number of stars in the
universe might be 1022
or 1024
.
Just by looking at the similarities between subatomic and astronomic levels, today, I postulate
(fantasize) that we have exactly 1 mole (= 6.022140857(74) ×1023
) of stars in our universe.
By-
Babloo Sharma