Could life form in outer space?

All life we know of to date (presumably) formed on a rocky planet (more precisely: earth). Fiction has been written about life in more exotic locations. Though as far as I know, these lifeforms were always on the surface or in the atmosphere of some large(ish) celestial body.

How can I scientifically justify life₁ forming without the presence of such a body?

One thing I have in mind is nebulae, which apparently can contain all necessary ingedients for life as we know it! Answer need not necessarily adhere to this premise, any environment where these life forms can float around freely (and possibly evolve to travel interstellar space over time) will do.

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Could life form in outer space?

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