At this stage of our understanding of the planet Mars, we have seen salty water flowing (recurring slope lineae), found evidence of ancient riverbeds, and seen seasonal changes in the polar caps. But an important question is how does water behave on Mars? A bit of science here on Earth gives some insight. Water at sea level on Earth boils at 100 degrees Celsius, which actually defined the Celsius scale. But as pressure changes, liquids boil at different temperatures. As the atmosphere gets thinner, the boiling temperature of water decreases. On Mars, with it’s extremely thin atmosphere, this means that water...
A couple of weeks ago, using the Subaru Telescope, astronomers from the Carnegie Institution for Science discovered the newest dwarf planet of our solar system, which may end up claiming the title for most distant dwarf planet. The object, which isn’t even confirmed as a dwarf planet yet, is called V774104. It resides a distance of 2-3 times that of Pluto, around 9 Billion Km. It is expected to be a little less than half of Pluto’s size, and it may have a highly eccentric orbit, bringing it closer to the Sun over it’s multi-century trip around the solar system. “That’s...
A video released a couple of days ago is a brilliant short film about a group of friends who went in to the Nevada desert and built a scale model of the solar system to give us a perspective on how large space actually is. Filmmakers Alex Gorosh and Wylie Overstreet led the project, which featured footage of the production of the model as well as some interesting results. Watch right to the end, where some fabulous footage of the Apollo program is shown, along with some inspiring words from the few men who have seen the Earth from beyond...
One of the big questions in astrophysics is about variation of the laws of Physics. The laws we know and are familiar with; angular momentum, gravity, energy, are the same everywhere on Earth. But what about beyond Earth? The universe is so large and so vast, we may be in a local region where the laws of Physics are set, and our laws may be different from a distinct region somewhere else in the universe. The good news is that we can make predictions based on our understanding of physics. And with our powerful telescopes that allow us to view a variety of...
How do we determine the size of the Universe? How do we know how far away the planets and stars are? How can we measure it without ever being there? The answer, as it always is in Astronomy, is light! More Photons = More Science! Here’s my video explaining the concepts of Parallax, spectroscopic parallax, and type 1a supernovae! Space is big, and although we can figure out how big it is, its another challenge all together to understand and comprehend its sheer size.
This amazing video from animator Alphonse Swineheart gives us an idea of the vastness of space, showing how incredibly large our solar system is. There are a few long trips between planets, but some fun facts keep it interesting. Plus the point is that we are getting an idea of the scale of it all. One thing to keep in mind is that each second the viewer is travelling 300,000 Km, equivalent to circumnavigating the Earth almost 8 times! A good thing to remember is that if we were seeing the distance to the next star, proxima centauri, this video...
A set of questions I get from kids and adults alike while doing my Astronomy in Action planetarium shows consists of the following: Does the Universe have an end? How big is the Universe? Where is the center of the Universe? What is the ‘Observable Universe?’ How is it different from just saying ‘the Universe?’ First of all, let me say that it is really hard to imagine the Universe as it is, even with a solid understanding of large-scale Physics. This is because there is no analogy in our lives, no reference point in our everyday experience. It’s very...
