Actually much warmer after the Sun ignited. We can go over the Stefan Boltzmann Law.
This is the first mistake.
The Sun AND THE PLANETS ACCRETED long before the Sun ignited.
Again, logical scientific deduction:
If there was a Nebular cloud, and eddies was created with the fact that throughout the area where this cloud existed, gravitational points initiated.
These Eddies were all over, as observed in many examples throughout space with current tellescope.
As a matter of fact, The centre of the Solar system did not have a Sun, but verry small iceball dust strewn out all over the nebular centre for a couple of astronomical units radius.
These "thissle balls" then joined together, as the eddy currents swirled the other smaller balls around the centre.
As the centres grew larger, they draw more thissle balls towards them, in the same way solid material will collect at the bottom of a bucket when a liquid is stired.
There is no "bombardment" of meteorites and asteroids, but a gentle orbit around the centre which does not have the velocities to maintain its altetude. Therefore it will move closer to the eddie's centre.
Now, this centre still did not have the mass of the current planets or Sun, therefore, the velocities of the matter arriving at the surface of the small protoplanets, perhaps as it grew from a few mm to a diamiter of 10 Km to 100 Km, did not "smash" into the protoplanet at any noticeble force. Today a Meteorite will enter the atmosphere at 50 000 Km per hour because the Earth has a much higher gravitational force than what this proto planet had.
This gravitational forces increaser only at a later stage when the planets eventually shaped into a planet with a gaseous atmosphere, and a dense core.
But before this happened, the Earth was nothing more than a collection of Icy space dust growing bigger and bigger.
Returning to the Sun, it was also acreting more and more matter, and initially the sun was also just a speck of dust particles larger than the surrounding area. there must have been billions of such specks, and they started to move towards each other.
These particles eventually joined, and the Sun also had a size of a few mm, and as it grew, the same happned with the planets in the rest of the Solar System.
Now, as the Sun and the planets grew, the centre of this collection of matter, which turned slower than the outer limits , allowing more matter to be collected by these billions of smaller thistle balls, and the Sun became bigger than the rest of the other planets.
eventually the Sun was so large, that its gravity pulled matter into itself, and eventually broke the critical point, and Nuclear fusion occured.
However, the Sun did not immediately ignite to its fullest, the size of it would prevent a full nuclear reaction, and as its core increased its gravitational field, it eventually took "flame".
At that stage, the Planets were already almost the size of what they have today and already, well almost, contained all the solids, gasses and liquids of its current status.
The most important point to remember is that at this point, when protoplanets were already huge, did some bash into each other at higher velocities, due to the increased gravitational forces they aquired.
this was the reason for meteorites and asteriods, in the solar system.
They did not form before the Earth existed.
Anyhow, the above is a logical and scientific model that is the only viable one on the formation of the Solar system.
And this is the core difference between laplace's model and Kant's.
La Place postulated that the Sun was formed from all the matter in the Solar system, and as it turned, it shot out matter in the form of boiling matter, which sometimes returned to the Sun, and splatered other matter into the Solar System.
These giant magma balls eventually shaped the Planets.
This theory was found to be in error in the mid 1800's due to conservation of ennergy.
The speed of the Sun and the Planets does not allow the planets to have a source such as the Sun.
So, forget about an earth that was a melting ball, with stone hard meteorites bashing into it.
There is very little evidence to support that theory.
The Kantian model prevails by observation and mathematical calculations.
And since 1925 more and more discoveries in space proves that the Earth was a wet collection of Icy space dust.