Panel #1 (Title)
• This is Outer Space Pals #2. In this installment, we talk a bit about the birth of Earth's Moon.
• In 1898, English astronomer George Howard Darwin became the first to propose a theory that explained our Moon. He mistakenly believed that the Moon spun off a rapidly rotating Earth because of centrifugal forces.
• Almost 50 years later, in 1946, Canadian geologist Reginald Aldworth Daly put for the first theory that a giant impact had created our lone natural satellite.

Panel #3
• Indeed, our Moon is younger than most bodies in the solar system. Current theories place its formation 20 million to 100 million years after the main bodies in the solar system formed. That falls in the Hadeon eon, Earth's first geologic eon, which lasted from 4.6 billion to 4 billion years ago.

Panel #6
• Theia is the theorized planet-size body whose collision with Earth formed the Moon. Astronomers think Theia was about the same size as Mars (about 3,700 miles in diameter) and that it originally occupied a spot in Earth's orbit, either 60° in front of our planet or 60° behind it.
• The name for this body comes from Greek mythology. Theia was a female titan and sister of Cronos (Saturn). She was the mother of Selene (the Moon), Helios (the Sun), and Eos (the Dawn).

Panel #7-8
• This panel shows Theia striking Earth head on. Scientists who first proposed a collision between the two bodies originally thought it may have hit our planet at a steeper angle. Recently, though, the head-on impact has gained more support from analysis of rocks brought back to Earth from the Moon by three teams of Apollo astronauts.

Panel #9-11
• The collision between Earth and Theia didn't knock off a Moon-sized chunk that went into orbit around our planet. Instead, the collision created trillions of small objects that formed a ring around Earth. Eventually, gravity pulled the pieces together.

Panel #12
• Twins? Really??? Sounds like a mystery we'll have to explore in Outer Space Pals #3.