266 results

Exoplanets

Dust in a Hot Jupiter's Atmosphere

Precise measures by Hubble indicate that a roasting "hot Jupiter" close to its star has an atmosphere thick with dust.

Exoplanets

A Star with Five Planets

The Sun-like star 55 Cancri, just 41 light-years away, is now known to have at least five planets orbiting it.

Exoplanets

Amateurs Spot Transiting Exoplanet

Using modest gear and a lot of skill, amateur astronomers catch a record-breaking planet crossing the face of its star 250 light-years away.

Exoplanets

The Most Puffed-Up Planet

Astronomers have discovered possibly the biggest exoplanet yet. TrES-4 is about 70% wider than Jupiter and has the average density of balsa wood.

Exoplanets

Why So Lopsided?

A star 150 light-years away is surrounded by a disk of debris that might indicate that hidden planets are throwing their weight around.

microlensing diagram

Astronomy Questions & Answers

Why are there two peaks in the light curve on page 97 of the October 2005 issue?

Why are there two peaks in the light curve on page 97 of the October 2005 issue? One might imagine that a planet of the star would produce only one sharp peak on the rounded dashed line. But why two? This is an insightful question, because astronomers who use the…

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