Jean Tate
Horsehead Nebula
[/caption] The Horsehead nebula is a dark nebula that looks like a horse's head! It is part of the Orion…
Angular Motion
You watch something (some distance from you) move … its direction changes … that's angular motion. In other words, as…
Infrared Spectroscopy
[/caption] Infrared spectroscopy is spectroscopy in the infrared (IR) region of the electromagnetic spectrum. It is a vital part of…
Gravity Constant
[/caption] The constant of gravity, or gravity constant, has two meanings: the constant in Newton's universal law of gravitation (so…
What is the Aurora Australis?
Aurora australis (also known as the southern lights, and southern polar lights) is the southern hemisphere counterpart to the aurora…
Deep Impact
[/caption] Deep Impact is the name of a NASA space mission whose primary objective was to study Comet Tempel 1…
What is an Event Horizon?
The event horizon of a black hole is the boundary ('horizon') between its 'outside' and its 'inside'; those outside cannot…
Betelgeuse
[/caption] Betelgeuse is the ninth brightest star in the sky, and the second brightest in the constellation of Orion (it's…
What is the Aurora Borealis?
[/caption] The aurora (plural aurorae) borealis has many other names: northern lights, northern polar lights, polar lights, and more. An…