Indonesian astronomers have conducted a comprehensive study of an open cluster in the constellation Norma, known as NGC 6134. Results of the new study, available in a research paper published June 23 ...

Astronomers have discovered the largest known cloud of energetic particles surrounding a galaxy cluster—spanning nearly 20 million light-years. The finding challenges long-standing theories about how ...

The Bullet Cluster is a massive collection of two large groups of galaxies some 3.8 billion light-years distant. The two groups appear to have collided in one of the most energetic events known in the ...

Common cluster headache triggers include drinking alcohol, smoking, and eating certain foods. Identifying your triggers may help reduce the frequency and severity of your headache attacks. Many people ...

The Bullet Cluster, named for its distinctive shape, has long been considered a smoking gun for the existence of dark matter in space. What makes this cluster famous isn’t the violence of it all. It’s ...

A most glorious deep-sky treasure hides in plain sight in the spring sky — the Coma star cluster (Melotte 111), which Ptolemy cataloged as a “nebula” around A.D. 138. This spangle of seven prominent ...

Whenever the moon shines near the Pleiades in December and January, it's nearly full. And on Thursday night, Jan. 9, the 10-day old moon will actually pass through the Pleiades. Most North American ...

New findings explain the Phoenix cluster's mysterious starburst. Data confirm the cluster is actively cooling and able to generate a huge amount of stellar fuel on its own. The core of a massive ...

Over the past year, cluster munitions—weapons banned by a majority of the world’s countries—have killed or injured hundreds of civilians in Ukraine. Their use, which began the first day of Russia’s ...