Our planet orbits the Sun. 365.25 days to go full circle (ellipse actually) and bring the seasons to Earth. But the Sun is not really stationary, it’s actually moving through space. It’s orbiting the center of the Milky Way, along with the rest of the galaxy. It actually has a periodic motion as it moves around the Galaxy, slowly moving up above the galactic plane then being pulled back down below by the disk stars. Currently, the Sun is moving toward the constellation Hercules at a speed of around 72,000 Km/h. It is also moving up to the top of the...
Titan is the most interesting body in the solar system from a weather standpoint. It has a thick and robust atmosphere, a liquid cycle of methane and other hydrocarbons, and it has seasonal variations in these patterns. It’s essentially a cold and oxygen-deficient version of Earth. Because the seasons on Titan take 7.5 years to pass, we have few opportunities to study them up close with the Cassini spacecraft. So as long as Cassini is operating, we are using our time wisely to see how Titan is changing. The first major change is a giant ice cloud that has formed...
After an epic weekend of eclipse talk, NASA came out with a press conference that overshadowed much more than just the Moon. The announcement, as many had speculated, revealed that conclusive evidence shows there is flowing water on Mars. Like seasons on Earth, warmer conditions cause water to flow down steep hills and into valleys. The speculation came due to the invitation of Lujendra Ojha of the Georgia Institute of Technology to the NASA panel. Ojha noticed strange features on Mars as an undergraduate student in 2010, while looking at images from the Mars Reconnaissance Orbiter (MRO)’s High Resolution Imaging Science...
Time to celebrate! It’s the shortest day of the year in the northern hemisphere, and the longest in the southern. The first day of Winter here, and the first of Summer down south. Although as a Canadian, Winter usually starts a lot earlier. Why do we have seasons? A common misconception is that the Earth is closer to the Sun in Summer, and further in Winter. Well I can tell you the Earth reaches perihelion (its closest point to the Sun) on January 3rd, and it certainly isn’t a warm day in Canada, historically speaking. So the reason for the...
