If you look up into the sky on a clear night, you would see thousands of stars. There are surely many more that you would need a telescope to see. But there are not stars everywhere. You can zoom in further and further with bigger and bigger telescopes, until eventually you find gaps where you simply don’t see stars. For a long time it was thought that the gaps were empty, until the Hubble telescope peered through the darkness by taking a 200 hour exposure of a supposedly empty patch of sky. What it revealed was a universe full of...
After focussing all of its energy on taking science data during closest approach, New Horizons has been slowly but surely sending back the stream of information collected on the Pluto system. This long process of returning the data to Earth has meant periodic updates for humanity, and a rekindling of excitement for the newest secrets revealed about the dwarf planet. Here is a video of the region of Pluto imaged in high resolution, followed by some of the best still along the way. This is the closest and most detailed view of Pluto that humanity will have for decades. We...
Massive stars and low-mass stars live different lives. They are born in different environments, fuse different elements during the course of their lives, release different amounts of radiation across the electromagnetic spectrum, die in different ways, and enrich interstellar space with different metals. We see stars at all stages of life in the galaxy, and their study allows us to piece together how stars form, and how the rarest ones are different. The image above shows two distinct clouds, both about 5,000 light years away in the constellation Cygnus, along the Galactic plane. The smaller bubble on the left, literally...
Data is beautiful. There is elegance in the artful manipulation of data to communicate information. I love to see new ways to communicate science to the layman and give an understanding of the collective human knowledge. So I had to post this timeline of the universe infographic, containing events from the beginning of the universe all the way up to the death of the Sun. This is obviously just the tip of the scientific iceberg so to speak, but some of the highlights chosen cross several disciplines of science and are truly significant events in history. Enjoy the truly beautiful...
What do other planetary systems look like? We have seen some where massive Jupiter-sized worlds orbit closer to their star than Mercury does to the Sun, baking them with radiation. Others have had multiple rocky planets within the Earth’s orbit distance. Some have planets similar to Earth in a variety of locations. But what about far away from the star? We never expected to find gas giants like Uranus and Neptune in the far reaches of our solar system. Are there planetary systems where planets live even farther away? Maybe there are planets that live in the empty darkness between stars,...
How do stars lose mass? For a star like the Sun, it shoots out a swath of charged particles into space and sheds mass at a rate of 4 million tons per second! Though even at this rate, the Sun only loses 1% of its total mass every 160 Billion years, so it’s not disappearing anytime soon. For more massive stars, the process can become complex and strange. The red hypergiant VY Canis Majoris, one of the largest known stars, is about 40 times as massive as the Sun, but humungous in scale. If this star were to replace the...
As someone who is a hobbyist astrophotographer, I’ve got a laundry list of astronomical events to photograph. Nebulas, Galaxies, star clusters, eclipses, and of course, aurorae! Where do the best aurorae happen? Near the north and south poles, so naturally it makes sense to visit those places where there is a bit of civilization, far north or south, with clear skies. The two places that are on my top list, outside of northern regions in my home country of Canada, are Iceland and Norway. Here are some reasons why: The aurora borealis are legendary in these parts of the world....
The Past: Mars has water, and it used to have a lot more. If modern Mars had the ocean it once had, it would evaporate off into space quickly because there is no heavy atmosphere to help keep it pressurized and in liquid form. Mars would have had a thicker atmosphere in addition to it’s magnetic field in order to keep all that water in one place. So where did the atmosphere go? And if there was such a thick atmosphere, how does it account for the fingerprint of excess Carbon-13 and a lack of Carbon-12 found on the red planet...
Some of the most gorgeous, ghostly, and variable objects in the universe are planetary nebulae. They are all formed in a similar process, as a low-mass star (like our Sun) sheds it’s outer layers of gas and dust, heating them to a glow as they disperse over hundreds of millions of years. A few Billion years from now, the Sun will undergo the same major state change. When this happens, perhaps other species in the far future will gaze upon it and marvel at its beauty. One of the difficulties in studying a planetary nebula is measuring it’s distance from...
As the results from Pluto and its system of moons continues to pour in, we are seeing a lot of scientists keeping busy in excitement as they interpret the data and work to understand the complexities of the recently illuminated dwarf planet. The fascinating images that have returned have also been interpreted and manipulated in ways that show fascinating features and unexpected views. A recent rendering shows a complete rotation of Pluto and Charon from images taken by New Horizons. Since it takes Pluto 6 days, 9 hours, and 36 minutes to rotate, New Horizons couldn’t take high resolution images...
