Question

3.Sa iyong palagay, bakit kaya mayroon tayong mga daungan sa ibat-ibang bahaging ating bansa?​

Answer 1

Answer:

You are thinking it should be 28 because the age of the universe since the big bang happened 13.7 billion years ago. So by common logic the limits of observable universe should encompass a giant sphere with a radius of 13.7 billion light years or 28 billion light years in diameter.

However, this reasoning only holds true in a static universe. Our is not a static universe. It's continuously expanding. Hubble's law states that areas of the universe that are distant from us are expanding away from us faster than the speed of light.

Special Relativity prevents objects in the same local spacetime from moving faster than the speed of light with respect to each other, but the theory doesn't come into play for distant objects when the space between them is itself expanding. (See Cosmic Redshift). In fact, physicists think that there are regions which fall outside the diameter of the observable universe that are moving away from us at a speed greater than light. And as such, light from these stars and galaxies will never reach us.

Right after the big bang the universe went under a great expansion phase known as the inflationary epoch where the rate of expansion was much much greater than the speed of light. And thus we have the diameter as 93 billion light years and not 28.