Good question - some would say that it was a singularity...
the singularity
Most scientists believe that an infinite dense singularity existed before the incident known as the Big Bang.
yes
A singularity, made of unimaginably dense material.
yes *Our whole universe was in a hot, dense state. It's a line from a song by the Barenaked Ladies called The Big Bang Theory, created as the opening song to the show The Big Bang Theory.
the singularity
A singularity is a point in space-time in which matter and energy are infinitely dense, as at the center of a black hole or at the moment of the Big Bang.
Gravity. Note that mostly it wasn't all that dense.
Most scientists believe that an infinite dense singularity existed before the incident known as the Big Bang.
All matter. All the matter that exists emerged from the primordial cosmological state that we call the 'Big Bang'.
yes
A singularity, made of unimaginably dense material.
point is a point but point is a point
We have no idea what it was that exploded in the Big Bang, but it probably was NOT "matter" in the sense that we think of now.
The "Big Bang" is a theoretical model to explain how the universe was formed. According to this theory, at one point in the far distant past, the universe was condensed into one infinitely small, yet infinitely dense point. Something (still the subject of debate) made this point, called a singularity, unstable and caused it to explode. When the theory was first suggested, "Big Bang" was applied in a derrogatory manner, however, it has since caught on and become the dominant title for this particular theory. Of course, having an "infinitely small" and "infinitely dense" anything is effectively meaningless and is still one of the largest criticisms levelled against it, however, there are no other models that explain the current state of the universe as well.
yes *Our whole universe was in a hot, dense state. It's a line from a song by the Barenaked Ladies called The Big Bang Theory, created as the opening song to the show The Big Bang Theory.
No. An explosion is an expansion of matter from a central point of high density to outer points of lower density. This is NOT what happened during the Big Bang, despite numerous popular presentations to that effect. The Big Bang was NOT an expansion of dense matter from a central point into empty space. It was an expansion of space itself.