long-period comets come from Oort cloud; their orbits suggest that the cloud is a spherical shell close to a light-year across, bisected by a doughnut; the rest of the solar system lies in the doughnut hole
Exoplanet discovery: seven Earth-sized planets found orbiting nearby star
The top row shows an artist’s conception of the seven planets of with their orbital periods, distances from their star, radii and masses as compared to those of Earth. The bottom row shows data about Mercury, Venus, Earth and Mars.
The Great Red Spot is a great anti-cyclonic (high pressure) storm akin to a hurricane on Earth, but it is enormous (three Earths would fit within its boundaries) and it has persisted for at least the 400 years that humans have ob
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