Astrochemistry Flashcards
When was CH, the first known interstellar molecule, discovered?
In 1937
When was H2 discovered?
In 1970. It was found in diffuse clouds by optical spectroscopy
How many interstellar molecules are known?
218 (as of 02/2020)
The core in interstellar dust is usually made of…
silicate
Why are interstellar dust important?
Because they catalize other processes
How are interstellar dust created?
By heavy particles (such as iron) attracting other particles that stucks on its surface
How many amino acids have been identified in meteorites?
over 200
When did the earth form?
4.567 billion years ago
RNA polymers may have formed more than ___ billion years ago
4.17
The formation of RNA polymers presumes what?
Seasonal cycles of dry and wet creating photodissociation and hydrolysis.
What are exo-/endothermic reactions?
Reactions with less/more energy in the product than in the reactants.
Why are ion-neutral reactions favorable in the interstellar medium?
Because they do not possess activation energy
How is H2 formed?
On the surface of interstellar dust
What is the most likely reaction with H2 in cold clouds?
0+ + H2 –> OH+ + H (this is exothermic)
97% of the times a cosmic ray hits H2 it creates…
H2+
