Anything infinitely small does not exist although some objects act as if they are point-like. In mathematical Real numbers – no. The set of Real numbers , , is defined to have the Archimedean property. If you are a mathematician you would hold this view to be indisputably true.

April 1995

Quarks arose in the 1964 as a way to explain the behavior of particles discovered through high-energy atomic collisions (this is what the Large Hadron Collider, like all particle accelerators, actually does: it smashes atoms and subatomic particles together allowing us to see what happens).

Quarks are fundamental building blocks of matter. They are most commonly found inside protons and neutrons, the particles that make up the core of each atom in the universe.

The diameter of the proton is about as much as a millimetre divided by a thousand billion (10^-15m). Physicists can not yet compare what`s larger: a quark, Higgs boson or an electron. “So we can say that an electron is lighter than a quark, but we can not say that it is smaller than quark” – concludes Prof. Wrochna.

So no, 1 is not infinitely greater than 0, but undefined-ly greater than 0. Nevertheless, it is exactly one more than zero. This is the difference between absolute differences and relative differences.

Quarks are the smallest particles we have come across in our scientific endeavor. The Discovery of quarks meant that protons and neutrons weren’t fundamental anymore.

The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.

So why is the Planck length thought to be the smallest possible length? The simple summary of Mead’s answer is that it is impossible, using the known laws of quantum mechanics and the known behavior of gravity, to determine a position to a precision smaller than the Planck length.

Originally Answered: Is there anything smaller than a Planck length? There is no even theoretically possible measuring device that can measure differences between two locations that are closer together than a Planck length. Thus, the Planck length is the smallest possible unit of measurement.

While speaking at the American Astronomical Society’s 222nd conference, Todd Henry – the Professor of Astronomy at Georgia State University – revealed that a star can be no smaller than 8.7 percent the diameter of our Sun to sustain nuclear fusion.

“Jupiter is called a failed star because it is made of the same elements (hydrogen and helium) as is the Sun, but it is not massive enough to have the internal pressure and temperature necessary to cause hydrogen to fuse to helium, the energy source that powers the sun and most other stars.

UY Scuti

All stars are white because they emit all wavelengths. Having said that their temperatures mean that they will have a bluer or redder tint, so their spectral class will be red, orange, yellow, yellow-white, white blue-white and blue (Classes M (orC&S), K, G, F, A, B & O).

violet

Some stars are much more powerful than others, emitting far more light. How much light a star emits depends on just two things: its diameter and its surface temperature. Every star shines because it’s hot, and a simple rule says that the hotter it is, the more energy every square inch of its surface gives off.

Red stars

red

Now, let’s see which are the shiniest stars in our beautiful starry night sky.

1. Sirius A (Alpha Canis Majoris) Our number one star on the list.
2. Canopus (Alpha Carinae)
3. Rigil Kentaurus (Alpha Centauri)
4. Arcturus (Alpha Bootis)
5. Vega (Alpha Lyrae)
6. Capella (Alpha Aurigae)
7. Rigel (Beta Orionis)
8. Procyon (Alpha Canis Minoris)

No, you can’t actually touch them. That’s about as cold as stars get, today, in the Universe. It’ll start out hot, but over the eons, it’ll cool down, eventually becoming the same temperature as the background level of the Universe – just a few degrees above absolute zero. Astronomers call these black dwarfs.

Red dwarfs

The smallest stars in the universe have exceedingly long lives — in fact, none have faced their end yet. Red dwarfs, stars with less than 0.4 solar masses, burn so slowly that they might live to 100 billion years old, much longer than the current age of the universe.