Answer:
The rhyme scheme of these four lines is:
AABB
Step-by-step explanation:
To determine the rhyme scheme of a poem, we must notice the final sound of the final word in each line. The very first final sound is attributed the letter A. If that sound repeats in another line, that line too receives A. The next different final sound will be B, then the next will be C, and so on. Let's analyze the lines given in the question:
They stared transfixed for hours, not realizing time was slipping by.
Then, the goddesses stopped singing, and they all said goodbye.
Astra and Nova returned home before long,
With the memory of the goddess' enchanting song.
The final words in each line are "by", "goodbye", "long", and "song". The first sound, "by", is A. The second line also ends with the "by" sound in the word "goodbye", which means it is also A. So far, we have AA.
The third line ends with "long", which does not rhyme with "by". Therefore, "long" is B. The last line ends with "song", which has the same final sound as "long", making it B as well.
Therefore, the rhyme scheme of these four lines is AABB.