Mars opposition is in mid-January next year. But before that happens, Mars is going to enter retrograde motion, where it stops being overtaken by the background stars and starts overtaking them back. Retrograde motion stumped the ancient astronomers and had a hand in stimulating the rise of modern scientific thought.
Citizen Science
What is a moon, and can it be an asteroid?
Inspired by a video of an eclipse of Phobos, Bill wondered about the definitions of moons, planets and asteroids. Why are potato shapes important, and how did Phobos stop being one and start being another?
What’s the time on the Moon?
How do we tell the time on the Moon? This will be an important issue once humans establish a long-term presence there. We list a few of the problems with time, and how they’ll probably agree on a single Coordinated Lunar Time.
About that Nova in Corona Borealis…
T Corona Borealis is expected explode in a cosmic event called a nova in the near future. However, it hasn’t happened yet. Now the sun is approaching and is threatening to drown out the star before it goes off. We might have to wait until January to see what happens.
A star in Corona Borealis is about to go WOOF!!
A dim star in Corona Borealis, currently invisible to the naked eye, is about to explode in what’s known as a nova. This particular star does it every 80 years or so, and it’s due around now, and showing signs of activity. We got a “before” photo.
Can citizen scientists help with planetary defence?
Asteroids, for the most part, are lonely rocks orbiting quietly in the solar system. They orbit the Sun in ellipses, meaning that when measured from the Sun, sometimes they’re nearer…
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Macrophotography of a Bindii with the WeMacro Rail
Remember those horrible prickles in summer lawns? They’re often caused by Bindii, which have vicious spikes that stick a seed to your foot. The plant spreads itself using you as transport. Bill took a macrophoto of the Bindii using a WeMacro Rail and a reversed lens. You can see how nasty this creature is.
A brief look at the Move-Shoot-Move Phone Adapter
The Move-Shoot-Move Tridaptor phone holder is an all-metal holder which is adjustable in three axes. We tested some eyepieces with the holder and discussed some of the criteria you should use when deciding which one of the many phone holders you should choose.
What’s an infinity corrected objective, and why use it in macrophotography?
An infinity corrected objective is a lens used for macrophotography. It looks very much like a microscope lens, and when you pair it with a tube lens it has quite a few advantages over more traditional macro lenses.