Scientifically speaking, which came first, the sun or the earth?

Basically, they appeared at roughly the same time, about 4.6 billion years ago. Before that, the whole solar system was a kind of nebula, but some parts started to coalesce at the centre (the sun), while other parts grouped together as planets, asteroids and the oort cloud. When they finished separating, you had more or less what we have now. However, the sun, collecting mostly the hydrogen and lighter elements, went into a nuclear reaction, while the lump that became the earth solidified into a less hot body.

There might be a separation in time there, somewhere, of maybe a few million years after the nuclear reactions started, but it's not much in terms of 4.5 or 4.6 billion years.

The Earth and the other planets are by-products of the Sun's formation.

Here is a human analogy: If the Sun was a baby, the planets were the placenta that continued to evolve separately.

The Sun.

The sun. Because how would you see to build an earth.

The sun is believed to be about 4.6 billion years old, the Earth comes in a little younger at 4.5 billion.

neither, really. they are contemporary. That is, neither suddenly came to be when it wasn't a few moments beforehand, so one did not precede the other. Both formed over millions and millions of years, and both were forming from the same basic mass of material at the same time, but in different places.

sun

The sun, but not by much.

The sun because then there would be no gravitational force to hold up the earth.

thank you for all answers, i appreciate them