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<p>Rotational temperatures of hydrogen molecules desorbed from plasma-facing surface was measured in three different tok

Kyoto

Fusion model hot off the wall

Predicting molecular rotational temperature for enhanced plasma recombination

<p>Schematic of the experiment: in an ion trap (grey), a laser wave (red) is sent onto HD+ molecular ions (yellow/red do

HHU DE

How atomic nuclei vibrate

Physicists have measured the wave-like vibration of atomic nuclei with an unprecedented level of precision.

Sandia

Stunning discovery: Metals can heal themselves

Microscopic cracks vanish in experiments, revealing possibility of self-healing machines

UFL

Evidence of Diverse Organic Material on Mars

Scientists, including UF astrobiologist Amy Williams, gain vital insights into Mars’ history and potential for supporting life

<p>An artist's composite image of a photo of the above-ground portion of the IceCube Neutrino Observatory along with the

NSF

First 'ghost particle' image of Milky Way galaxy captured by scientists

Elusive neutrinos reveal a portrait of our galaxy unlike any before.

Physics and Astronomy Online

Welcome to PhysLink.com - the physics and astronomy online portal! We feature latest physics news and editorials, extensive science reference and constants section, education section where you can ask our experts any physics or astronomy related question. Also, don't miss our fun page and our online science store.

ScienceIQ Facts

How Fast is Mach 1?

by Anton Skorucak and ScienceIQ.com

A Mach number is a common ratio unit of speed when one is talking about aircrafts. By definition, the Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling.

It is said that the aircraft is flying at Mach 1 if its speed is equal to the speed of sound in air (which is 332 m/s or 1195 km/hr or 717 miles/hour.) An aircraft flying at Mach 2 is flying at twice the speed of sound in air, etc. Mach numbers are named after Ernst Mach (1838-1916), an Austrian philosopher and physicist. The term Mach number came into use in 1929.

Physics & Astronomy Facts

Images from the EIT (Extreme-ultraviolet Imaging Telescope) instrument on the SOHO spacecraft.

Ultraviolet Light

Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the 'electromagnetic spectrum'. Radiated energy, or radiation, is given off by many objects ...

Introduction to Constellations

'Constellation' is the name we give to seeming patterns of starsin the night sky. 'Stella' is the Latin word for star and a constellation is a grouping of stars. In general, the stars in these groups ...

Saturn: The Basics

To ancient astronomers, Saturn was a wandering light near the edge of the known universe. The planet and its rings have been objects of beauty and wonder ever since Galileo noticed the 'cup handles' t ...

'There must be no barriers for freedom of inquiry. There is no place for dogma in science. The scientist is free, and must be free to ask any question, to doubt any assertion, to seek for any evidence, to correct any errors.'

J. Robert Oppenheimer
(1904-1966)

Science Sidebar

Beyond the bubbling volcano: Secrets to successful science fair projects

We have put together a list of tips to help you and your child find and develop a successful science fair project. In addition, we've added age appropriate guidelines when needed.

10 Ways to Keep Your Kids Interested In Science

Young children are natural scientists: they ask questions, pick up sticks and bugs outside, and are curious about the world around them. But as they get a bit older, many kids gradually lose their interest in science. Here are tips to get them excited about science again!

Cool Summer Science Projects

Summer is a natural time for learning about science. Longer days and the freedom from school schedules allow kids the opportunity to explore the world around them in new and exciting ways. Here are a few ideas to help get you started.