A Wee Spot O' Nuthin'

A scientist friend of mine sent me this link. It gives an interesting perspective on planet Earth. I have not checked it for accuracy.

FYI:

• Sirius is the brightest star in the sky and is in the dog that follows Orion around.
• Arcturus is in the constellation Bootes. Bootes looks like an ice cream cone and Arcturus in at the point of the cone.
• Betelgeuse and Rigel are both in the constellation Orion. Rigel is brighter.
• Antares is in the constellation Scorpius.

Have you seen these stars or is Bocagrande too bright? Go to the mountains of Colorado (where I am from) if you want to see a bazillion stars.

Anybody have an estimate, and the math to back it up, for how many Earths might fit inside Antares?