The phrase "a massive cluster of" is correct and usable in written English.
It can be used to describe a large group or collection of items, people, or phenomena that are closely grouped together.
Example: "The night sky was filled with a massive cluster of stars, twinkling brightly against the darkness."
Alternatives: "a large group of" or "a significant collection of".
Astronomers have used NASA's Chandra X-ray Observatory to make the most detailed probe yet of the distribution of dark matter in a massive cluster of galaxies.
Just before Flight 447 went down, it charged into a massive cluster of roiling clouds, even as three other planes made wide turns to avoid the weather.
When the light from very distant galaxies passes through a massive cluster of galaxies, like in the Bullet Cluster, the cluster can bend the path of the galaxy's light, in essence acting like a lens.
Based on a phenomenon first recognized by Einstein but not demonstrated until 1979, gravitational lensing involves having a massive cluster of galaxies in the foreground that magnifies passing light from more distant and otherwise invisible objects, thereby making them visible to Earth's most powerful telescopes.
The software runs on a massive cluster of supercomputers, using 36 server nodes which between them have 72 processors with 432 cores, as well as 144 GPUs (graphics processing units, high-performance specialised chips typically used to deal with visual data).
The team first witnessed the supernova last year, as it exploded behind a massive cluster of galaxies 5 billion light-years from Earth called MACS J1149.5+2223.
The images show (A) a mid-sized sphere cluster (13 of the 35 spheres in this section) within a small artery and (B) a larger artery with a massive cluster (44 of the 306 spheres in this section).
Instead, astronomers suggested that the stars had been born in a massive cluster at a distance of a hundred light-years or so and then migrated inward.
This X-ray emission extends outward from the central galaxy for at least 300,000 light years and shows that the known radio source is in the central galaxy of a massive cluster.
In the big image at left, the many galaxies of a massive cluster called MACS J1149+2223 dominate the scene.
By the time 4 or 5 billion years had gone by, it became clear we'd never become part of a massive cluster.
