There are four fun­da­men­tal forces in the cos­mos. Why are they im­por­tant?

All About Space - - Michio Kaku -

The uni­verse is ruled by four fun­da­men­tal forces.

We have the elec­tro­mag­netic force, which lights up our cities.

It’s re­spon­si­ble for light bulbs, tele­vi­sions, ra­dio and the en­tire elec­tro­mag­netic spec­trum. Then we have grav­ity, which holds the Sun to­gether, it holds the So­lar Sys­tem to­gether and keeps your feet on the ground. Then we have the two nu­clear forces, the weak force gov­erns ra­dioac­tive de­cay, and the strong force holds the pro­tons and nu­cle­ons to­gether.

To­gether they com­prise all the forces known about the uni­verse.

Weak

An in­cred­i­bly small force, it causes the ejec­tion of sub­atomic par­ti­cles and trans­for­ma­tion of an el­e­ment. This force re­sults in phe­nom­ena such as beta de­cay. Elec­tro­mag­netism

Con­trols the elec­tro­mag­netic spec­trum, from ra­dio waves to gamma rays. This force en­sures the in­ter­ac­tions be­tween elec­tric forces. Grav­ity

An at­trac­tive force with the far­thest reach. Grav­ity is what keeps the plan­ets or­bit­ing the Sun and keeps our feet planted firmly on the sur­face of the Earth. Strong

The force that keeps neu­trons and pro­tons bound to­gether, it's con­sid­ered to be the strong­est among the four forces.

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