The phrase "a gigantic cloud of" is correct and usable in written English.
It can be used to describe a large, indistinct mass or collection of something, often in a metaphorical or literal sense.
Example: "As the storm approached, a gigantic cloud of dark rain loomed on the horizon, threatening to unleash a downpour."
Alternatives: "a massive plume of" or "an enormous mass of".
Both cars splintered apart, bounding off the track in a gigantic cloud of debris and dust.
In September of 1859, the entire Earth was engulfed in a gigantic cloud of seething gas, and a blood-red aurora erupted across the planet from the poles to the tropics.
The cluster is composed of thousands of galaxies enveloped in a gigantic cloud of hot gas, and an amount of dark matter equivalent to more than a hundred trillion Suns.
I had to change planes in Las Vegas, but when I got there I was told that my flight to Anchorage had been cancelled, on account of a volcano in the Aleutian Islands that had erupted and "burped" — the technical term — a gigantic cloud of ash into the lower stratosphere.
WASHINGTON--On 11 January, Earth got a visitor from space: a gigantic cloud of magnetized solar gas.
A long time ago, but actually far, far away from any galaxy, stars formed by the bushel within a gigantic cloud of gas.
I had to change planes in Las Vegas, but when I got there I was told that my flight to Anchorage had been cancelled, on account of a volcano in the Aleutian Islands that had erupted and "burped"—the technical term a gigantic cloud of ash into the lower stratosphere.
They started with the birth of a hypothetical galaxy about 9 billion years ago--at the point at which the gigantic cloud of dust and gas had formed but had not yet coalesced into a disk--and ran the simulation to the present day.
And while we don't yet know the details of this plan, we can certainly hope that the gigantic cloud of toxic petroleum spreading through our pristine beaches, killing nature and man's livelihood with its oleous plumes, is understood to be the ultimate warning sign that our oil addiction is literally killing us.
The findings strengthen the idea that large galaxies don't emerge whole from single, gigantic clouds of dust and gas.
In an early era of the universe, tiny versions of the Milky Way coalesced out of gigantic clouds of hydrogen gas that permeated the cosmos.
