infrared
infrared light
infrared radiation
infrared emission

The ships overhead would be scanning for electronic and infrared emissions.

We will soon be bombarding the universe with more radio and infrared emissions than ever before.

Their greatest difference is probably in their near infrared emissions.

She only saw them against the craggy polyp because of their infrared emission.

There are unexplained sources of infrared emission, far out among the galaxies.

In the 1970s, astronomers found unexpectedly high levels of infrared emissions from Titan.

The result was the detection of the first faint infrared emissions from the region.

"We've been collating data on infrared and radio emissions."

The continued rapid cooling of the infrared emission from the sphere got her back on solid ground again, so she finished with that.

Instead, the infrared emission is like an oven's, or worse.