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First Cygnus Cargo Ship from Virginia in Two Years Docks at Space Station

Installation complete! Orbital ATK’s Cygnus cargo spacecraft was attached to the International Space_Station at 10:53 a.m. EDT on 23 Oct. 2016 after launching atop Antares rocket on 17 Oct. 2016 from NASA Wallops in Virginia. Credit: NASA After a two year gap, the first Cygnus cargo freight train from Virginia bound for the International Space Station (ISS) arrived earlier this morning – restoring this critical supply route to full operation today, Sunday, Oct. 23. The Orbital ATK Cygnus cargo spacecraft packed with over 2.5 tons of supplies was berthed to…

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Earth electricity electromagnetism Featured Guide to Space magnetic field magnetosphere magnets Physics 

What is a Magnetic Field?

Everyone knows just how fun magnets can be. As a child, who among us didn’t love to see if we could make our silverware stick together? And how about those little magnetic rocks that we could arrange to form just about any shape because they stuck together? Well, magnetism is not just an endless source of fun or good for scientific experiments; it’s also one of basic physical laws upon which the universe is based. The attraction known as magnetism occurs when a magnetic field is present, which is a…

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What are the Different Masses of the Planets?

It is a well known fact that the planets of the Solar System vary considerably in terms of size. For instance, the planets of the inner Solar System are smaller and denser than the gas/ice giants of the outer Solar System. And in some cases, planets can actually be smaller than the largest moons. But a planet’s size is not necessarily proportional to its mass. In the end, how massive a planet is has more to do with its composition and density. So while a planet like Mercury may…

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