This technique would make planetary detection possible for stars within approximately 10 parsecs (about 32 light years) of Earth.

Bright, hot rocket exhaust makes detection, discrimination and targeting easier.

First year plants can seed, making early detection important for eradication.

Thus, the adverse consequences of some drugs may be disguised by a delayed effect that makes detection especially difficult.

They moved in single file to make detection harder.

These methods make detection by authorities time-consuming and difficult.

Colon cancer often has no symptoms at all until its later stages, which makes early detection so important.

Successful new drug therapies make early detection and treatment more important, advocates and health professionals say.

Some viruses employ techniques that make detection by means of signatures difficult but probably not impossible.

This makes detection of such emails harder for mail filters and users.