“Venus is too hot, Mars is too cold, and Earth is just right,” says planetary scientist Dave Brain. But why?
Archive for the ‘Astrobiology’ Category
It has been called the most bizarre star in our galaxy and some think it just might be home to high-tech aliens.
The unlikely suggestion that aliens live in this star system is being taken so seriously that a team of astrophysicists wants to train a radio telescope in its direction to determine if any signals could indicate advanced extraterrestrial life.
According to Tabetha Boyajian, a postdoctoral astrophysicist at Yale University, the most likely natural explanation is that light from the star is being blocked by a massive swarm of comets that has descended close to the solar mass.
Dr Wright at Penn State is about to publish an alternative explanation for the star’s light patterns. He says the patterns of light are also consistent with a “swarm of megastructures” orbiting the star, perhaps formed by enormous solar collectors.
Such energy collectors are dubbed Dyson structures, named after physicist and mathematician Freeman Dyson, who suggested in 1960 that advanced civilisations would use such structures to collect massive amounts of solar energy.
What does that mean? It means we’re allowed to get a little bit excited! Not because aliens are a likely possibility, but because we’re in the middle of an awesome mystery the likes of which we haven’t seen before in the history of space exploration. Word is that SETI (Search for Extraterrestrial Intelligence) Institute scientists are considering devoting their time to it, and hopefully more research teams will get involved too. I seriously cannot wait to see what they come up with.
Beginning in 2011, scientists using the Mars Reconnaissance Orbiter (MRO)—the best camera looking down on Mars—found hundreds of streaks, about 5 meters wide, that appear seasonally on steep slopes. They show up during the warm season, grow hundreds of meters long, and then fade as winter approaches. For many years, the team made the obvious interpretation: the streaks meant that water was flowing. Salts were expected to be present in the water, because they lower the freezing point of water by tens of degrees, and they also make the water less likely to evaporate in Mars’s barely-there atmosphere. But until the researchers directly detected a signature for water in the streaks, or found evidence for salts precipitating out of the water, they were unwilling to declare the case solved.
Now, they have found evidence for those salts, using a different instrument on the MRO. And this suggests that water is flowing on Mars!
The Fermi Paradox is really cool. There is a great written explanation of it here.
Or you could also check out this clip:
Life on Earth requires three things: liquid water, a source of energy within a habitable range from the sun and organic carbon-based material. But life is surprisingly resilient, and organisms called extremophiles can be found in hostile living conditions (think extreme temperatures and little access to oxygen). Extremophiles give astrobiologists hope for life in the universe.
Astronomers believe they have found an alien solar system packed with a record-breaking three potentially habitable worlds.
New observations of the star Gliese 667C—about one-third the mass of our sun—is home to between five and seven planets, three of which are classified as super-Earths. All three are larger than our own planet, but smaller than gas giants like Uranus and Neptune.
But what makes all the difference is that these super-Earths orbit in what is known as the “Goldilocks Zone”—the region around a star where temperatures are just right for liquid water, a key ingredient in the recipe for life, to exist.
These planets are good candidates to have a solid surface and maybe an atmosphere like the Earth’s.
What makes this finding so exciting is that for the first time, astronomers have three potentially rocky or ocean worlds orbiting the same star. And at 22 light-years away from Earth, Gliese 667C and it’s two companion stars are considered relatively close neighbors to our solar system, making them ideal candidates for future extraterrestrial searches for life.
Billions of stars. Billions of galaxies. A thousand years just to count all of the stars in our galaxy and then another thousand to count the galaxies in the universe.
Could there be intelligent life on other planets? This question has piqued imagination and curiosity for decades. Explore the answer with the Drake Equation — a mathematical formula that calculates the possibility of undiscovered life.
The search for worlds outside our solar system has come a long way since the first exoplanets were confirmed in the early 1990s. Since then, the average rate of alien-world discoveries has shot from about three per year to between fifty and a hundred per year in the last five years. As of the end of 2012, with the tally standing at 854 newfound worlds and reports of new detections being announced nearly every week, thanks in large measure to NASA’s Kepler space telescope, astronomers are calling this the golden age of exoplanet discovery.
Now the race is on to find Earth’s twin, the elusive Earth-size planet in the habitable, or “Goldilocks,” zone around a star where liquid water can exist—and experts believe we may hit the cosmic jackpot soon.
In 2012 astronomers came closer than ever to zeroing in on an earthly doppelganger, or at the very least a planet considered potentially habitable.
However, we are far from confirming the habitability of any of these planets until we have the capability to observe their atmosphere, but that will take many years. The big goal now is to find an Earth-size planet in its star’s habitable zone—something more similar to Earth.
Astronomers have made a sweet discovery: simple sugar molecules floating in the gas around a star some 400 light-years away, suggesting the possibility of life on other planets.
The discovery doesn’t prove that life has developed elsewhere in the universe—but it implies that there is no reason it could not. It shows that the carbon-rich molecules that are the building blocks of life can be present even before planets have begun forming.
Scientists use the term “sugar” to loosely refer to organic molecules known as carbohydrates, which are made up of carbon, hydrogen, and oxygen.