We may not give it much attention, but Earth is surrounded by more than 165 million pieces of space debris that could cause problems in the future. Continue reading
Bad news, Elon: There’s a chance your Tesla Roadster will come crashing down to Earth. Continue reading
NASA’s Cassini spacecraft will plunge into Saturn on September 15, incinerating itself after 20 years in space. Cassini grand finale ends on September 15th as it will burn into Saturn. It’s photos of Saturns rings are the clearest we have ever seen. Continue reading
The definitive answer about the direction water swirls in two hemispheres Continue reading
Is the equinox really when day = night?
How beautiful is a ring that sparkles, whether perched upon a finger or girdling a gas giant hundreds of millions of miles away. Continue reading
A lunar eclipse is an interplay between celestial motions, and the reflection, refraction and scattering of sunlight. Total lunar eclipses are beautiful events, and can be simply enjoyed for their own sake, or, whether with the unaided eye, binoculars, or a small telescope, are opportunities to do some basic science. Large telescopes confer no great advantage in viewing lunar eclipses.
Lunar Phases and Motions
Normally, the Moon shines by reflecting unaltered sunlight. A common misconception is that lunar phases are somehow caused by the shadow of the Earth falling onto the Moon. In reality, since the Moon is in orbit around the Earth, the Moon’s phases are the result of changing viewing angle of the Moon as it orbits the Earth once every 29.5 days.
Thanks to the Royal Astronomical Society of Canada for the permission to share this article.
How do you measure the distance to something so incredibly far away light a star? As you’ll see in this video from Scientific American, the math involved is actually quite simple and relies on a property called parallax. Click here to have a look.