Mark your calendars: The smallest planet in the solar system is about to make a REALLY big entrance.
A distant tailless comet hails from inner solar system, but as its lack of ice shows, it's likely an ancient body, hailing from when the planets were being born.
For a long time, scientists have operated on the idea that new planets form around young stars. But it turns out that dying stars may also be able to make baby planets.
Although we haven't yet pinpointed the location of a possibly large planet in the outer solar system, we are beginning to paint a picture as to what the mysterious world might look like and what it's made of.
An unprecedented observation of a dusty disk surrounding an old star has led to speculation that dying stars could give rise to a second generation of planets.
Before its planned crash into Mercury last year, NASA’s MESSENGER spacecraft gave scientists a parting gift.
Astronomers have found a protoplanetary disk surrounding a young star with a rather chilly secret.
An orphan planet free-floating in space more than 100 light-years from Earth may have a parent star after all, though the relationship could hardly be considered close.
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