[Europan Ocean (OP)]

Gold in our solar system, in the earth's crust formed in a nova or super nova, also everything heavier than iron, true? Was this a nova or super nova event? Was this about five billion years ago? What and where is the remnant of this star and explosion? Was there a resulting nebula? If so, what happened to it? Why wasn't there a resulting dwarf star or neutron star?

Did our solar system form from a nebula or where did the mass come from, for the sun and planets?

It formed a disc in line with the Milky Way's black hole?

Do nebulas have a life span?

[Origin]

Gold in our solar system, in the earth's crust formed in a nova or super nova, also everything heavier than iron, true?

Yes.

Was this a nova or super nova event? Was this about five billion years ago?

There were probably several nova and super nova that contributed heavy elements to the dust clouds that eventually became our solar system.

What and where is the remnant of this star and explosion?

White dwarfs, neutron stars and black holes.  They are long gone from our region of space.

Was there a resulting nebula? If so, what happened to it? Why wasn't there a resulting dwarf star or neutron star?

All these things are long gone.  4.5 billion years is a long time, we have orbited the milky way about 20 times since this happened.  In as little as 100,000 years the night sky will no longer have any recognizable constellations due to the motion of the stars.

Did our solar system form from a nebula or where did the mass come from, for the sun and planets?

It formed from a dust cloud or more correctly it formed from a 'molecular cloud'.

Do nebulas have a life span?

Yes.  There are many types of nebulas, but none of them are permanent features.  The quick answer on what happens to them is they either dissipate or coalesce.

[richadam]

To add to this, from what I remember iron is about as high on the periodic table as can be made in a star after the main sequence of its life, and then not for long. Anything after iron must be made by the incredible heat and pressure generated during a supernova.

[Eternal Student]

Hi.

   What impresses me isn't the ability @Origin has to answer something well,  it's the ability to do it in a small number of words.   

Best Wishes.

[evan_au]

super nova: gold, also everything heavier than iron, true?

That was once the popular theory.
- It's now considered that various supernova events can create perhaps 25% of heavy elements.
- But today it is felt that the majority of heavy elements are created in neutron star collisions
- a neutron star colliding with another neutron star
- or a neutron star disrupted by a black hole
See the periodic table at: https://en.wikipedia.org/wiki/Nucleosynthesis#History