"It will, I expect, be proven right. Light pressure is proportional to the square of the radius, while gravitation pull is proportional to the cube. The smaller the object, the lesser the gravitational influence in comparison to light pressure. If the comet tail is composed of minute particles, then they're bound to be blown away from the sun."
Nonomiya was now expounding earnestly. Haraguchi chimed back in his characteristic manner, "It's innocuous, but burdensome to compute. There's always give and take." His words restored levity to the party.
"It would seem that physics is no longer a naturalist endeavor," Professor Hirota stated.
The terms 'physics' and 'naturalist' both piqued the interest of the group.
"How so?" the physicist himself inquired.
Professor Hirota was compelled to explain. "I mean that to measure light beam pressure, one can't just open one's eyes and observe the natural world. In the fare of nature's offerings, light beam pressure is not on the list. You have to contrive an apparatus, of crystal thread, vacuum, mica, and the like. Only then can a physicist observe the phenomenon. The naturalist wouldn't go there."
"Nor would the romanticist," interjected Haraguchi.
"Yes, the romanticist would," Professor Hirota asserted emphatically. "The positional relationship of light beam and light receiver is foreign to the natural world. Isn't this the essence of romanticism?"
"But once that positional relationship is established, what follows is simply an observation of light's inherent properties. From there we're back to naturalism," Nonomiya offered.