The jostling of the giant planets Jupiter and Saturn in the solar system’s early days may have delivered a Mercury-type building block to baby Earth, providing the planet with the chemistry to heat its convecting, liquid metal core to this day
NASA's Cassini mission has spotted a small Saturn moon illuminated by reflected sunlight off Saturn's atmosphere.
The primordial planet believed to have smashed into baby Earth, creating a cloud of debris that eventually formed into the moon, was chemically a near-match to Earth.
There are many things in life whose constancy we can rely on -- friends, family, death, taxes -- but our home planet isn't one of them. Things are 'a' changin'. Slooowly. How would you feel about longer days, shorter springs, and a new north star?
Jupiter's early migration through the inner solar system caused gravitational mayhem, but it ultimately settled to allow Earth to form in a relatively quiet neighborhood.
Earth is in what's called the habitable zone. It's far enough from the sun that it doesn't get fried, and close enough that it gets the best of its warmth. We like to think we're special for this, but it turns out we might be pretty run of the mill.
The first day of Spring began with some dazzle in Europe and the Arctic with a solar eclipse.
This week, the moon will completely cover the disk of the sun, creating a solar eclipse that only a small part of the world can see.
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