Estimating age at death for adults involves observing morphological features in the skeletal remains, comparing the information with changes recorded for recent populations of known age.

Multi-sensor and multi-date remotely sensed data and advanced digital image processing techniques are extremely useful to observe and map morphotectonic features.

Lowell observed spoke-like features and a central dark spot, yet it is now known that Venus' atmosphere is opaque.

Structures such as tree rings and the various tissues are often observed features.

The doctor may ask the patient to walk in a corridor or climb stairs to observe specific features including:

Joe, leaning back against another paneled unit with his hands in his coat pockets, was observing other features of the surroundings, near and far.

Radar observed several circular features that may be craters in the bright region Xanadu during Cassini's April 30, 2006 flyby of Titan.

In 1952, Bock observed enough unique skeletal features to assign it to its own family Halticosauridae.

By working on 'narrative networks,' these authors defend it is possible to observe and measure new structural features of the narrative.