The smaller rocks are composed of those materials in solid state (e.g., ice not water). They are less irradiated as they are further away from the Sun (think the asteroid belt and beyond). Atmospheric entry (if that's what you mean) is irrelevant. What matters here is the transport of materials from a place where they could have formed, to a place where they couldn't.

▲

adrian_b 20 hours ago | parent | next [-]

Atmospheric entry is completely relevant because some people have made the illogical claim that meteorites falling on Earth could have contributed with such complex organic substances, like the nucleobases, to the appearance of life on Earth.

The icy bodies from the outer Solar System that contain such organic substances are very easily vaporized during entry in the atmosphere of the Earth, so only a negligible fraction, if any, of the organic substances originally present in such a body would reach the surface of the Earth.

▲

foxglacier 15 hours ago | parent | next [-]

Wouldn't a big enough asteroid have an inner part which survives entry? You seem to be saying that it's impossible for any meteorite that might have these chemicals to not be completely vaporized which seems doubtful. Have you got a source?

▲

dylan604 12 hours ago | parent [-]

So you survived re-entry. Now, you get to survive impact. Seems like the energy released would also be damaging

▲

stouset 7 hours ago | parent | next [-]

Most asteroids have slowed to terminal velocity by the time they impact. It’s not nothing, but it’s mostly going to be relevant to physical processes and not chemical ones.

You might consider that scientists advanced enough in their field to be launching missions to retrieve dust from asteroids are actually aware of basic facts relevant to their field of study.

	▲	Citizen_Lame an hour ago \| parent \| next [-]
		Quality of comments massively dropped on the HN. It feels like Facebook now.
	▲	lazide 7 hours ago \| parent \| prev [-]
		[flagged]

▲

XorNot 2 hours ago | parent | prev [-]

Generally speaking small molecules aren't damaged by concussive shock.

▲

soco 18 hours ago | parent | prev [-]

So we get organic vapors in the atmosphere right. Shouldn't that matter?

	▲	adrian_b 17 hours ago \| parent [-]
		One theory is that the primitive Earth contained much smaller quantities of the volatile chemical H, C, N, O and S, which are the main constituents of water and of organic substances. Then Earth collided with a great number of small bodies formed in the outer Solar System, which were rich in water and organic substances. This has modified the composition of the Earth towards the current composition. (Later Earth has lost a part of its hydrogen; because hydrogen is very light, it is lost continuously from the upper atmosphere, after water is dissociated by ultraviolet light; thus now the Earth has less water than around the appearance of life.) This theory is likely to be true, so meteorites probably have brought a good part of the chemical elements most needed by living beings. However, most of the pre-existing organic substances from meteorites must have decomposed and whatever has been preserved of them could not have had any significant role in the appearance of life here, because any living being would have needed a continuous supply with any molecules that it needed, otherwise it would have died immediately. Such a continuous supply could have been ensured only for molecules that were synthesized continuously in the local environment here, not for molecules arriving sporadically in meteorites and which would have been diluted afterwards over enormous areas, down to negligible concentrations.

▲

lazide 19 hours ago | parent | prev | next [-]

The earths poles?

▲

naasking 21 hours ago | parent | prev [-]

> Atmospheric entry (if that's what you mean) is irrelevant.

I think the OP meant that Earths magnetic field and atmosphere shields any terrestrial matter far more than than a bare asteroid that has no such protections, so it seems implausible at first glance that these things would develop or survive in open space rather than here.

▲

Supermancho 8 hours ago | parent [-]

> it seems implausible at first glance that these things would develop or survive in open space rather than here.

I don't think "organics developed in the vacuum of space" is implied. Survived? Well we have samples now confirming, if I'm understanding the basis for the discussion (the article).

▲

lazide 7 hours ago | parent [-]

We have some organic ‘building block’ compounds confirmed frozen on some asteroids.

But what we don’t have is any examples of them surviving re-entry.

We also have a massive amount of those same compounds already here on the planet.

Causality is… tenuous. But not impossible.

	▲	beowulfey an hour ago \| parent [-]
		Causality was not the point. The point was to refute the seeding hypothesis, and because they found those molecules, the effort to falsify the hypothesis failed. Now we can move on to the next attempt to refute, which, as you say, might be to study whether molecules can survive conditions of reentry. Experiments do not tell us that something IS a certain way; only the ways it is not.