Which portion of the HR diagram has stars with the greatest luminosity?
What is 2 plus 2?
What color is orange?
Which side of a HR diagram has the warmest stars?
What number planet is Earth from the sun?
What is the largest planet in our solar system?
Pluto is considered a dwarf planet?
How many planets are there?
When a tree falls in the forest it makes a sound?
How many known comets are there??