News tagged with motions

Measuring the proper motion of a galaxy

The motion of a star relative to us can be determined by measuring two quantities, radial motion and proper motion. Radial motion is the motion of a star along our line of sight. That is, motion directly toward us or away ...

dateSep 23, 2014 in Astronomy
shares0 comments 1

Knee-deep sensing

A new, non-invasive technique to track the motion of knee bones in 3D with a very high precision has been presented by researchers in Australia. By employing a single-element ultrasound sensor and a fast image registration ...

dateAug 19, 2014 in Engineering
shares0 comments 0

Microscopic rowing—without a cox

Many different types of cell, including sperm, bacteria and algae, propel themselves using whip-like appendages known as flagella. These protrusions, about one-hundredth of a millimetre long, function like tiny oars, helping ...

dateJul 29, 2014 in Cell & Microbiology
shares0 comments 1