'vastly studied' is correct and usable in written English.
You can use it to describe a topic that has been the subject of extensive research and examination. For example, "The effects of climate change have been vastly studied in recent years."
One of the novel tools currently vastly studied are nanoparticles.
Human retina is a diverse and important tissue, vastly studied for various retinal and other diseases.
ε-Polycaprolactone is a biodegradable polymer vastly studied for various fields of tissue regeneration and wound healing (Merrell et al. 2009; Saeed et al. 2015).
Although various self-healing approaches have been vastly studied, employment of different assessment methods in these studies has made it difficult to compare the efficiency of various self-healing mechanisms.
SoD policy has been considered as a fundamental principle of information security; the concept of SoD can be traced back to 1975 when Saltzer and Schroeder [11] took it as one of the design principles for protecting information, under the name "separation-of-privilege". Later on, SoD has been vastly studied by various researchers as a principle to avoid frauds.
A vastly studied mechanism of reducing WWOX at the transcriptional level is the hyper-methylation of CpG islands in its promoter and coding region [18].
Temporal load aware optimization, minimization of power consumption as a function of time has vastly been studied.
The first CTAS guideline was published after years of work in 1999; since that time, it has been vastly reviewed, studied, and validated and a pediatric triage guidelines was published later in 2001 [10].
As case studies, monthly rainfall data across a network of raingages from two vastly different areas are studied: (1) Western Australia – data over a period of 67 years (1937 2003) from 57 raingages; and (2) Sydney catchment – data over a period of 114 years (1890 2003) from 47 monitoring stations.
The web makes it vastly easier to study every aspect of a potential new home, from the quality of its apartment stock to the surliness of its baristas, all without leaving home.
The DNA of dog and man are sufficiently alike so that gene maps of inherited canine diseases will help identify the genes for their human counterparts... Hereditary illness is vastly easier to study in dogs... Purebred dogs are far more genetically homogeneous than any human population, and that makes it easier to trace and identify recessive genes in them...
