The research team released a nonperiodical newsletter to share interim results and observations.

The comet's brightness fluctuated nonperiodically, puzzling astronomers who expected a regular pattern.

We adopted a nonperiod accounting approach to reflect transactions that span multiple fiscal years.

The researchers identified a nonperiodic pattern in the signal that defied conventional analysis.

Last night, amateur astronomers reported spotting a faint nonperiodic comet moving against the backdrop of distant stars.

Amateur astronomers organized a night watch to observe several nonperiodic comets passing near Earth.