Why does a star exert a strong gravitational force?

Question

this is a question for my science revision. im 14 though so please dont make the answer complicated to understand!

Oh and also, aparently the steady state theory is about the origin of the universe? What is it?

Answer 1

Because it contains mass. A *lot* of mass.

Steady state theory is a separate question, it states that matter is constantly being created as the universe expands. The vast majority of reputable scientists no longer take it seriously because it contradicts virtually every other cosmological theory there is as well as observed results. As is often the case, some creationists embrace it because it's contradicts the big bang model and is therefore less likely in their eyes to disprove the first few verses in Genesis.

Answer 2

Because the gravitational attraction of a body is proportional to the mass of the body. Three times the mass, three times the attraction, 1000 times the mass, 1000 times the attraction. Stars have a LOT of mass.

The gravitational attraction between two masses is proportional to the product of their masses and inversely proportional to the square of the distance between them. This was worked out more than 300 years ago, so it is not new.

Steady state theory has nothing to do with the origin of the Universe. It implies that the Universe is already infinitely old and is expanding because of the continuous (steady) creation of atomic (or smaller) particles at a very low rate. This theory has now been discounted.

Answer 3

Gravitational force is caused by the presence of mass. There's a huge amount of mass in stars, therefore they exert a strong gravitational force.

The so-called 'steady-state theory' of the universe proposed that the universe had no beginning, such as the Big Bang. The steady-state theory said that the universe had always existed. Few if any professional scientists today believe in the steady-state theory because there's hardly any evidence to support it, while there's a ton of evidence to support the Big Bang theory.

Answer 4

There is no single steady state theory (SST). It means any theory in which the properties of the universe on the largest scale in terms of time and space remain the same forever. The most popular SST that survived the discovery that the universe is expanding supposed that, as the universe expands and existing matter rarifies, new matter spontaniously materialized to take its place. This allows the universe to expand forever, but to never decrease in average density. The problem with this theory is that it does not account for *other* evidence of a big bang, such as the microwave background radiation.

Answer 5

According to Newton's Law of Universal Gravitation, the gravitational force between any two objects is directly proportional to the product of their masses and inversely proportional to the square of their separation distance. So if we are talking about a relatively massive object like a star, it normally follows that i can exert a strong force.

Answer 6

http://en.wikipedia.org/wiki/Steady_State_theory