The phrase "a mass of only" is grammatically correct and can be used in written English.
It can be used to describe a quantity or amount that is limited or restricted in some way.
Example: "The research revealed a mass of only minor errors in the report, which was a relief to the team."
Alternatives: "a quantity of just" or "an amount of merely".
A VLBA antenna has a mass greater than 200 tons, but inflatable antenna technologies may enable launch of an orbiting antenna with a similar diameter, but a mass of only a few hundred kilograms.
We are always impressed by a major league pitcher's ability to throw at 95 mph, but a baseball has a mass of only 0.145 kg.
Since the strip has a mass of only 23 mg, opening times of 20 μs (FWHM) or shorter can be obtained.
In particular, the researchers showed they could, in principle, find subhalos with a mass of only 10 million times that of the Sun, 100 times lighter than the one they found.
The young star has a mass of only 0.18 times that of the sun.
The best fit to the data indicates a six-year orbit around Sirius A and a mass of only.
Human life is a mass of statistics only for statisticians: the rest of us live in a world of individuals, and most of them are not prominent.
Although the 2015 Hakone Volcano eruption was a small-scale phreatic eruption with a discharged mass of only about 100 tons, interferometric synthetic aperture radar successfully detected surface deformations related to the eruption.
One of the dwarfs, Sagittarius II, with a gas mass of only 1300 solar-masses, is unusual in that it is small in size even for a dwarf galaxy and might instead be considered as the most extended globular cluster of stars for its brightness.
The sulfation is thus very important and colitis is observed, although less severe, using also DSS with a molecular mass of only 5 kDa [21].
The next blood measurement, at 22 years of age, when clinical obesity was present, corresponded to a TCDD mass of only 410 ng, far lower than the body burden about 10 years earlier.
