How did discovering the KBOs demote Pluto's planetary status?

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If Pluto were to be considered a major planet, then many Kuiper Belt Objects are almost as big as Pluto, also orbit the Sun, some of them have moons also, and most are in more circular orbits closer to the ecliptic, behaving more like planets than Pluto does. Should they not also have been counted as planets as well?

Physics & Space Science

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Where is the newest material in the Earth's crust found?

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Physics & Space Science

Monochromatic light hits a piece of glass. Assuming the frequency remains constant, what happens to the wavelength in the glass as the index of refraction decreases?

a. decreases c. increases b. approaches 3 × 10^8 m d. remains constant

Physics & Space Science

About how old is Earth?

a. 6000 years b. 1 million years c. 1 billion years d. 5 billion years e. 14 billion years

Physics & Space Science

State a testable prediction of the nebular theory that has been confirmed by observations of extrasolar planets. Does this confirmation mean the theory is completely correct?

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Physics & Space Science