Site Glossary

motion toward or away from an observer.

Treatment using high-energy radiation to damage cancer cells.

A telescope that detects radio waves from space using large dish antennas.

Electromagnetic waves with the longest wavelengths.

(radioisotope)— an isotope with an unstable nucleus that emits radiation.

a method of estimating the age of ancient organic materials using carbon-14.

Distance from the centre of a circle to the moving object.

the unpredictable fluctuations or variations that occur when making measurements.

Horizontal displacement from launch to landing.

refers to the measurement of how something changes or progresses over time.

often expressed as a ratio of two different quantities, such as distance over time or change in a variable over time.