Ether
Greek Mythology is a study of Greek Gods and Goddesses'
Helium is a element named after the Greek sun god, Helios.
No, there is no ancient Roman (or Greek) god named Dian. The closest would be Dionysus, from Greek mythology. However, in Irish/Celtic mythology, there is a character known as Dian.
No-one knows...Greek mythology has no dates or chronology.
The only planet whose name in English is not derived from Greek or Roman mythology is Earth.
In the regions known to ancient Greece and the Mediterranean.
In Greek mythology, a god associated with sleep was Hypnos. In Roman mythology, this god is called Somnus. The Greek god of dreams was Morpheus.
There is a three headed dog in Greek Mythology, that guards he underworld. It is called Cerberus.
He is called Poseidon in Greek mythology, and Neptune in Roman mythology.
Saturn was called Saturn in roman mythology. Saturn in greek myth was called Cronus.
Greek Mythology, also called Classical Mythology is the ancient religion of the ancient Greeks: as reported and reduced by Greek poets of old.
Mars. He is called Aries in Greek mythology.
Yes. It was called drachmas.
Chronos
In Greek mythology it is Poseidon. But in Roman mythology, it is Neptune.
The dragons of Greek mythology - giant, serpentine monsters with rows of sharp teeth; called Drakones.
Midgard and Asgard are in Norse mythology not Greek, the bridge is called Bitfrost (the rainbow).