Astronomy Archives

June 27, 2020June 27, 2020 by Matt Williams

A Simulation of Sunsets on Other Worlds: From Venus to Titan

When we think of exploring other planets and celestial bodies, we tend to focus on the big questions. How would astronauts live there when they’re not working? What kind of strategies and technology would be needed for people to be there long term? How might the gravity, environment, and radiation effect humans who choose to make places like the Moon, Mars, and other bodies place their home? We tend to overlook the simple stuff…

For example, what will it be like to look up at the sky? How will Earth, the stars, and any moon in orbit appear? And how will it look to watch the sun go down? These are things we take for granted here on Earth and don’t really ponder much. But thanks to NASA, we now have a tool that simulates what sunsets would look like from other bodies in the Solar System – from the hellish surface of Venus to the dense atmosphere of Uranus.

June 26, 2020June 26, 2020 by Evan Gough

Another Collection of Newly Forming Planetary Systems. This Time from the Gemini Planet Imager

This figure shows the dust rings around young stars captured by the Gemini Planet Imager Exoplanet Survey, or GPIES. The rings show a diversity of shapes and sizes, made more extreme by the different projections of the rings on the sky. (UC Berkeley image by Thomas Esposito)

Over the next decade, several very powerful telescopes will come online. Observing time on these ‘scopes will be in high demand, and their range of targets will span a whole host of topics in astronomy, astrophysics, and cosomology.

One of the topics near the top of the list is exoplanets.

But how will astronomers know where to spend their precious exoplanet observing time?

June 25, 2020June 24, 2020 by Andy Tomaswick

Curiosity Sees Earth and Venus in the Night Skies on Mars

Mars rover Curiosity covered in dust and a combined image it took of Earth and Venus both in the Martian night sky. — Curiosity, seen here covered in dust, took two separate images that have been combined into one showing Earth and Venus in the night sky of Mars.

Normally the images from NASA’s Curiosity rover, currently sitting near “Bloodstone Hill” on Mars, are of alien vistas and rock outcroppings that conspiracy theorists constantly try to anthropomorphize into UFOs. However, the rover is also excellently positioned to capture a unique perspective of an alien sky. And that is exactly what it did recently when it captured an image of both Venus and Earth in the same Martian night sky. The images were actually taken in two separate frames, though the two planets were visible in the sky at the same time.

June 24, 2020June 24, 2020 by Matt Williams

Calculate the Number of Alien Civilizations in the Milky Way for Yourself.

Planets everywhere. So where are all the aliens? Credit: ESO/M. Kornmesser

In recent years, the explosive nature of exoplanet discovery (over 4,164 confirmed so far!) has led to renewed interest in the timeless question: “are we alone in the Universe?” Or, as famed Italian physicist Enrico Fermi put it, “Where is everybody?” With so many planets to choose from and the rate at which our instruments and methods are improving, the search for life beyond Earth is really kicking into high gear.

At the same time, these discoveries have inspired a plethora of new studies regarding the ongoing Search for Extraterrestrial Intelligence (SETI). This includes the Alien Civilization Calculator, which is the brainchild of physicists Steven Woodling and Dominick Czernia. Inspired by recent attempts to address the statistical likelihood of advanced life in our galaxy, they offer a mathematical tool that can crunch the numbers for you!

June 24, 2020June 24, 2020 by Evan Gough

New Hubble Photos of Planetary Nebulae

Hubble was recently retrained on NGC 6302, known as the "Butterfly Nebula," to observe it across a more complete spectrum of light, from near-ultraviolet to near-infrared, helping researchers better understand the mechanics at work in its technicolor "wings" of gas. Image Credit: NASA, ESA, and J. Kastner (RIT)

Planetary nebulae are astronomy’s gateway drug. Their eye-catching forms make us wonder what process created them, and what else is going on up there in the night sky. They’re some of the most beautiful, ephemeral looking objects in all of nature.

The Hubble Space Telescope is responsible for many of our most gorgeous images of planetary nebulae. But the images are more than just engrossing eye candy. They’re documentation of a complex process that plays out over tens of thousands of years, all across the Universe.

And they’re a death knell for the star that dwells within.

June 23, 2020June 24, 2020 by Matt Williams

Another Starship Test Ends in an Explosion (Intentionally This Time)

Today, SpaceX experienced another explosion at their South Texas Launch Site in Boca Chica, Texas. Once again, the explosion occurred during a cryogenic pressure test, where a prototype was pressurized with liquid nitrogen to see how it held up. This time around, it was the test tank for the 7th Starship prototype (SN7), which was being deliberately pressurized to the point where it would fail – aka. “tested to failure”.

June 23, 2020June 22, 2020 by Paul M. Sutter

There’s no evidence that dark matter interacts with any other force but gravity

HD+ molecular ions (yellow and red pairs of dots: proton and deuteron) suspended in an ultra-high vacuum between atomic ions (blue dots). Credit: HHU / Alighanbari, Hansen, Schiller

Most of the universe is made of one of two kinds of mysterious substances, called dark matter and dark energy. From all the evidence, these two cosmic components only interact with “normal” matter through the gravitational force. And a recent nuclear experiment reveals no presence of any dark contamination in the bonds between atomic nuclei to a level twenty times better than previously recorded.

June 23, 2020June 23, 2020 by Evan Gough

Planets Form in Just a Few Hundred Thousand Years

Artist's conceptualization of the dusty TYC 8241 2652 system as it might have appeared several years ago when it was emitting large amounts of excess infrared radiation. Credit: Gemini Observatory/AURA artwork by Lynette Cook. https://www.gemini.edu/node/11836

Astronomers like to observe young planets forming in circumstellar debris disks, the rotating rings of material around young stars. But when they measure the amount of material in those disks, they don’t contain enough material to form large planets. That discrepancy has puzzled astronomers.

The answer might come down to timing.

A new study suggests that planets form much quicker than astronomers think.

June 23, 2020June 24, 2020 by David Dickinson

Comet U6 Lemmon Brightens in July

Comet U6 Lemmon promises to be a fine binocular object at dusk.

And then there were five. Though we’re long overdue for the next great ‘Comet of the Century,’ 2020 seems intent on on throwing decent binocular comets our way, the ranks of which include comets C/2017 T2 PanSTARRS, C/2019 Y1 and C/2019 Y4 ATLAS and C/2020 F8 SWAN. Now, C/2019 U6 Lemmon is set to take center stage in July.

June 22, 2020June 22, 2020 by Paul M. Sutter

Antares is a supergiant star that would fill the Solar System beyond Mars, but its atmosphere is 12 times bigger than that

This artist’s impression shows the red supergiant star. Using ESO’s Very Large Telescope Interferometer, an international team of astronomers have constructed the most detailed image ever of this, or any star other than the Sun. Credit: ESO/M. Kornmesser

Antares, the angry red eye of the constellation Taurus the bull, is a red supergiant star near the end of its life. And astronomers with the VLA and ALMA have realized that it’s much, much bigger than we ever imagined.