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Super-Earths may come in two flavors

Some of the exoplanets appear to be denser than others

1:55pm, September 8, 2011

Now that known exoplanets have become almost as numerous as fireflies on a midsummer’s eve, two top planet-finding missions are starting to disagree over the abundance of low-mass planets that are heavier than Earth but smaller than Neptune.

The Swiss-led HARPS mission suggests that between 30 and 50 percent of sunlike stars in the s

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