NASAのインスタグラム(nasa) - 6月9日 08時26分
Each year, Saturn's moon Titan drifts a little farther away from its planet.
How far does it drift? About 4 inches (11 cm) per year. As a moon orbits, its gravity pulls on the planet, causing a temporary bulge in the planet as it passes. Over time, the energy created transfers from the planet to the moon, nudging it farther and farther out.
The discovery was made using data from our @NASASolarSystem Cassini mission to Saturn, which ended in 2017. While scientists know that Saturn formed 4.6 billion years ago in the early days of the solar system, there's more uncertainty about when the planet's rings and its system of more than 80 moons formed.
The revised rate of its drift suggests that the moon started out much closer to Saturn, which would mean the whole system expanded more quickly than previously believed. Click the link in bio for more.
Credit: NASA/JPL-Caltech/Space Science Institute
#SolarSystem #Saturn #Titan #Astronomy #NASA #Cassini
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