gravity
Water Balloons in Space
As part of his ongoing (and always entertaining) "Science Off the Sphere" series, Expedition 31 flight engineer Don Pettit experiments…
Thin Skinned and Wrinkled, Mercury is Full of Surprises
[/caption] Until relatively recently, Mercury was one of the most poorly understood planets in the inner solar system. The MESSENGER…
Playing With Water… in Space!
Expedition 30 astronaut and chemical engineer Don Pettit continues his ongoing "Science off the Sphere" series with this latest installment,…
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America’s Youth Christen NASA’s Twin New Lunar Craft – Ebb & Flow
[/caption] A classroom of America’s Youth from an elementary school in Bozeman, Montana submitted the stellar winning entry in NASA’s…
Andromeda Dwarf Galaxies Help Unravel The Mysteries Of Dark Matter
[/caption] Yep. It's that time of year again. Time to enjoy the Andromeda Galaxy at almost every observing opportunity. But…
What did Isaac Newton Invent?
Sir Issac Newton is best know for his laws of motion. Many people's knowledge of his scientific contributions stops there.…
Gravitational Redshifts: Main Sequence vs. Giants
[/caption]One of the consequences of Einsteins theories of relativity is that everything will be affected by gravitational potentials, regardless of…
Precession of the Equinoxes
When he was first compiling his famous star catalogue in the year 129 BCE the Greek astronomer Hipparchus noticed that…
What is Gravitational Force?
Newton's Law of Universal Gravitation is used to explain gravitational force. This law states that every massive particle in the…
Ballistic Trajectory
[/caption] Imagine you throw a ball as hard as you can. The ball flies through the air and lands some…