Since the planet has only been detected indirectly, properties such as its radius and composition are unknown.

Alpha particle decays can also be detected indirectly by their coincident gamma radiation.

The ring arcs were detected indirectly in 1984 and first photographed by the Voyager 2 flyby mission in 1989.

Since it was detected indirectly through its gravitational effects on the star, properties such as its radius, composition, and temperature are unknown.

So far, gravitational waves have only been detected indirectly, and gravitational-wave astronomy remains more of a possibility than an actuality.

The point is that they were detected indirectly, by analyzing their telltale trails, their signature or "footprints."

Often the bands are detected indirectly because of the constrictions and swelling upon limbs, digits, etc.

Gravitational waves have been indirectly detected from the Hulse-Taylor binary.

The planet has only been detected indirectly, but is believed to be a gas giant, with no solid surface.

The third component, the dark matter, was detected indirectly by the gravitational lensing of background objects.