Is There Life on Exoplanets?

Posted by Andreas Christodoulou

Description: 

Most of the planetary scientists believe that there can be at least one exoplanet in our Milky Way galaxy, which has life. They have also figured out that 20% of the sun-like stars that exist on the Milky Way are circled by planets, which has the same dimensions as Earth. These planets are located in habitable zones around the stars as well. Therefore, life on exoplanets has become a popular topic among planetary scientists in the modern world. 

The habitable zone of a planet can simply be defined as the area where the temperature is not too cold or too hot. These conditions help water to exist in those planets in the form of liquid. It is vastly known that life cannot survive without water in its liquid form. Therefore, while it has been figured out that there are about 2,000 exoplanets circling beyond our own sun, the possibility to have some sort of life in these planets depends on a variety of factors. The obliquity of the planet holds a prominent place among them. Obliquity can simply be defined as the angle of axis of a planet relative to its orbital axis around the parent starts.

The planet Earth has a low obliquity when compared to other planets. It rotates around an almost perpendicular axis of its own while rotating around the sun. Planetary scientists have figured out that the obliquity can vary from one planet to another. They believe that the planets with an extreme tilt have a very low chance of having life in it. 

Recently some research scientists as the Massachusetts Institute of Technology figured out that water exists on planets that have a very high obliquity as well. Therefore, we can keep some hope that life can exist in the planets with a high obliquity. They also figured out a shallow ocean with a depth of about 50m in a specific planet, which has a comfortable temperature. According to their calculations, the average temperature of that planet was about 60-70 degrees Fahrenheit per year. 

However, a planet with a high obliquity usually has an extreme and inhospitable climate. The North Pole would receive sunlight for a period of 6 months continuously and it would have to go through an unending night for the other six months. As a result, they believed that such a planet has a very little chance of having life. That’s mainly because the planet would freeze and boil throughout the year, which is really tough for life to exist. Nevertheless, this can differ under some conditions. For example, the oceans can store heat during the summer period and give it out during winter. This can create a somewhat mild climate in the planet. Therefore, we cannot neglect with extremely oblique planets by saying that they are not in a position to inhibit life. 

It has been assumed that the Milky Way has about 200 billion stars. In addition, it has been calculated that there are about 11 billion planets with “habitable” living conditions. All these consist of hydrogen gas and they are seething hot. The planetary systems have been established circling such stars. In fact, sticky and fine dust particles melt together to create rocky cores, which eventually turns into major planets. 

The very first exoplanet was discovered by research scientists 20 years ago. It was circling a sun like star and was named as 51 Pegasi b. Since then, they have discovered a large number of exoplanets, where most of them were smaller than their very first discovery. They even discovered an exoplanet, which is 150 smaller than 51 Pegasi b. 

Many different methods are being used by research scientists in order to discover new exoplanets in the Milky Way. The Doppler Shift method can be considered as the most popular one. This is an effective method, which can be used to discover giant planets that exist closer to fiery stellar planets. This is a sensitive method and is associated with a higher chance of discovering earth-like planets. 

Throughout the past two decades, scientists have figured out many other methods to discover exoplanets apart from the Doppler Shift method. The major drawback with the Doppler Shift method is that it cannot be used to discover smaller planets that have a wider orbit around the stars. However, the recently discovered methods are in a position to help the scientists with discovering such planets. At the end of 2015, they have been able to discover more than 1,900 exoplanets that belong to over 1,200 planetary systems. 

The Kepler Space Telescope of NASA helps a lot for the scientists to discover new exoplanets. It was launched back in 2009 and has discovered few thousand candidate planets up to now. Most of these candidate planets were confirmed as exoplanets by scientists. Several statistical methods such as the verification by multiplicity were used by the scientists to figure out whether they are in a position to inhibit life or not. The Kepler Space Telescope follows a unique methodology when discovering exoplanets. It differs a lot from the Doppler Shift method. This method searches for extremely small dips in stellar brightness when a specific orbiting planet passes ahead of the glaring face of parent star. 

In the meantime, the scientists at MIT spent their efforts in order to create a model of a highly oblique aqua-planet. This planet had the same dimensions of earth and it was positioned at a distance similar to the earth’s separation from sun. This 3D model simulated circulations among sea ice, atmosphere and ocean. The effects of winds and heat were also taken into consideration. They also created a motionless planet for comparison and discovered the possibility of having life in such a planet. They had the ability to control the obliquity of this planet and they discovered that the ocean absorbs heat during the summer period. 

Given the scientific evidence and ongoing research therefore it appears that it is not science fiction to believe in life in other planets. While there is still a long way to go before we start packing, we can keep our fingers crossed for the prospect of habituating an exoplanet in the near future.

KEEP READING: Dreaming About the Future of Space Tourism

We have more goodies to read and watch. What are you waiting for, scroll on! Subscribe to our Newsletter for full access on our exclusive content.

*by andreascy*

Einstein’s Gravitational Waves Detected: A Breakthrough Discovery

Posted by Dr Stephania Savva

Description :

The discovery of Einstein’s gravitational waves reported during a blockbuster announcement in a news conference on February 11, 2016 at Washington DC, is making waves all over the world. What’s the big fuzz about it though and why should we care? This article explores the question by taking a more in-depth look into the phenomenon.

The scientific community are still overwhelmed by the news of the breakthrough discovery of gravitational waves in the form of faint ripples of gravity, reverberating invisibly through the fabric of space-time from the collision of two black holes. 

Laser Interferometer Gravitational-Wave Observatory (LIGO), designed to open the field of gravitational-wave astrophysics supported by Caltech and MIT, captured this groundbreaking moment in history reportedly on September 14, 2015. Nevertheless, what does the phenomenon entail in reality and why is it so important to us? We will try to demystify the latter in the next few paragraphs. 

What Are Gravitational Waves? 

The term gravitational waves was originally introduced by Einstein back in 1915 in establishing his theory of general relativity. The latter concept suggests that mass distorts both space and time similar to how a heavy bowling ball distorts a trampoline. 

When an object accelerates, it creates ripples in space-time, in the same way a boat causes ripples in a pond. These ripples that allude space-time are called gravitational waves. Due to the fact that they are extremely weak signals, it is difficult to detect them. Therefore, although there's convincing indirect evidence that gravitational waves exist, a direct detection had proven elusive, until now. 

Missions like LIGO and LISA are dedicated to detect these waves by observing small changes in the distances between objects at set distances. The most optimum opportunity to detect gravitational waves comes from detecting the collision of two black holes or pulsars into each other.

The Discovery

“We have detected gravitational waves. We did it,” Prof David Reitze, executive director of LIGO, told journalists. LIGO, uses the world’s most sophisticated detector, utilizing laser interferometry, which in simple terms means firing lasers into long, L-shaped tunnels; the waves disturb the light to detect the collision of black holes when they merged. A merger occurs when two black holes start to spiral towards each other and radiate energy as gravitational waves. 

Scientists listened the characteristic sound of these waves, namely a chirp, for 20 thousandths of a second as the two giant black holes, one about 36 times the mass of the Sun, the other slightly smaller at 29 solar masses, circled around each other.

The signal detected, allowed them to calculate how stars perish: the two holes had begun by circling each other 30 times a second. Before the final collision and a dark violent merger had occurred at the end of the 20 millisecond snatch of data captured, the two had accelerated to 250 times a second!

The research findings from this study, undertaken by the LIGO Collaboration, have been published in the journal Physical Review Letters.

Signals of Gravitational Waves, As Einstein Predicted detected by the twin LIGO observatories at Livingston, Louisiana, and Hanford, Washington. Image Credit: Caltech/MIT/LIGO Lab

Why It Matters

The significance of detection of gravitational waves is attributed in the following key issues:

1. The discovery of gravitational waves opens a new window to research of the universe since it provides with insights on its existence and a potential paradigm shift on how we detect and study cosmic phenomena, in particular those that do not radiate in the electromagnetic spectrum.

2. The findings of this research confirm Einstein’s prediction of gravitational waves as part of his Theory of General Relativity and regenerate the interest in exploring the theory in depth. 

3. Re-enforces the study on the use of gravitational telescopes which allows to hear phenomena at the same time as light-based telescopes see them.

4. Since gravitational waves were detected from the energy emitted from the collision of two black holes, it is now confirmed that black holes really do exist and that mergers between two black holes proceed as predicted.

Image by THE OFFICIAL ANDREASCY: Fast Facts about Gravitational Waves

In sum, the detection of gravitational waves opens the field to completely new investigation suggesting that some exciting days lay ahead for scientists. Stephen Hawking suggests that "gravitational waves could revolutionize astronomy".

Conclusion

Through this discovery we are one step closer to solving more of the mysteries of the universe following 380,000 years after it is thought to have been generated. And possibly the biggest mystery of it all: the 'Big Bang' singularity.

SOMETHING RELEVANT: Dreaming About the Future of Space Tourism

Have something to share about this story? Kindly let us know on Twitter (use #officialandreascy in tweet).

Space Travel and Exploration: Dreaming About the Future of Space Tourism

Posted by Andreas Christodoulou

Description :

Welcome fellow hustler! Busy morning? Here's what you need to know to start your day.

For ages mankind has dreamed of traveling the stars and visiting distant planets. Not just astronauts but civilians too. Over the years we have seen a few of these achievements come to fruition. People have been sent up to orbit the earth and collect data for scientists back on the planet. A select few have claimed the great achievement of setting foot on the moon. A rover was even sent to Mars and transmitted back pictures of the alien surface.

Even with all these advancements over the last 30 years, space exploration is still in its infancy. The recent crash of Virgin’s Space Ship Two can attest to that. Not only are the ‘kinks’ still being worked out, but what has been explored so far, is merely a drop in the ocean when compared to the billions and billions of stars that have yet to be reached. Aside from Mars and the Moon, our own solar system remains an unexplored mystery. With the future of space tourism hinging on uncertainty; what does this mean for the average citizen?

The taxpayer no longer foots the bill

When the idea of space travel was first put on the table, it was the taxpayer’s dollars that funded the missions. Politicians formed the plan, while the working class paid for it. With the introduction of private spaceflight, the politicians have no say and the American citizen isn’t left paying for everything. The only real restriction they have is how much money is available.

Failure is an option

Private companies can fail as much as they want, within reason. They aren’t tied to an ever shrinking budget like NASA was. Unfortunately, not every test is a success, just look at Virgin Galactic. The explosion of their Space Ship Two was a tragedy and devastating blow to private space flight; but this doesn’t mean they have to call it quits. And now that the politicians can’t step in and pull the funding, that’s one less hurdle they have to deal with. Virgin now has the option to try again, if the funds are there. 

Engineers play a bigger part

If one were to work for NASA as an engineer, they would be part of a larger team working together. With smaller teams being employed by private companies, it allows for a more hands on experience. The engineer actually gets to go in the field and fire the rockets, rather than sit behind a desk all day. Smaller teams and limited resources actually foster more creativity, making them almost like modern day MacGyver’s. 

The price of space travel will drop

The flight of a Virgin space plane costs $250,000. That’s nothing compared to the $12 million price tag of launching a satellite into orbit. On top of that, the rocket that sends it to space can only be used once. If the privately funded space planes can make it to orbit consistently, the price of space travel is going to be drastically reduced. A host of scientists are standing by waiting to run tests on these flights. Also, lower cost means more accessible tourism.

Hypersonic travel may finally happen 

Circumnavigating the globe will be achievable in an afternoon. The promise of sub-orbital travel has been talked about for a while now. Until these privately funded space flights came around, it has always been just out of reach. Right now $95,000 for a ticket still may not be for everyone, but as with any new technology it’s always expensive when it first hits that market. The first microwave cost about $5,000. Now you can pick one up for less than $50. The same thing will happen with sub-orbital flights. Once they hone the production process and discover cheaper ways to build these space planes, tickets may even be as cheap as regular commercial flights.

The view will be humbling

Every astronaut has said that seeing the planet against the infinite backdrop of space was not only awe inspiring, but life changing. What’s going to happen when an artist sees this for the first time? What happens when politicians and CEOs start to take these flights regularly? Will they be moved like the astronauts; or will it be business as usual? 

Even though Richard Branson suffered a major set-back, this doesn’t leave him down and out. Without politicians calling the shots, they can go back to the drawing board and try again. This doesn’t mean that failure isn’t costly; this just means that without the threat of having funding pulled, they have a better chance of learning from their mistakes. Whatever Virgin is doing in the wake of this tragedy, people need to start seriously thinking about how space tourism will affect their lives and how it’s about to change the world.

RECOMMENDED: The Infinite Stretch of the Universe

Get our tech emails and alerts. Not spam ever! We value your privacy.

*by andreascy*

Two New European Galileo GPS Satellites Launched Into Orbit This Month

Posted by Andreas Christodoulou

Description : 

The Galileo GPS system is entirely civilian, unlike its rivals designed by the Russian and American military, and when fully operational will offer a more robust GPS solution and exciting opportunities for GPS manufacturers around the world. This month, the European navigation system, Galileo, took a crucial step with the successful launch of two new satellites. The first test of the system will begin soon as there are now enough satellites in orbit to allow for more advanced testing of the system.

Two new Galileo satellites were placed into orbit by a Russian Soyuz rocket from French Guiana. This is an important step for the European navigation system as it will now be able to run a test phase so GPS manufacturers can start to access the capabilities involved. 

Galileo, which will eventually have 30 satellites in total, should be able to provide services to users in the first few years. "We are committed to provide reliable navigation in 2018," said Paul Flament, Program Manager at the European Commission.

A Success for Europe 

Arianespace CEO Jean-Yves Le Gall hailed this as "a success for Europe", seeing it as a "good omen." He also said that "new success" of a Soyuz rocket launch "confirms the exemplary nature of our cooperation with Russia."

The third mission of Soyuz from French Guiana placed the two new satellites on a circular orbit at an altitude of 23,222 km of the Galileo constellation. Each of the spacecrafts have weight 700 kg each.

Designed for a lifetime of 12 years, they join their counterparts in orbit and all four of them will form a "mini-constellation" that is fully operational so tests can be conducted. 

At first, and for a hundred days, it will ensure that new satellites are stable enough for Galileo and are functioning properly. Operational navigation tests will probably not commence until around February of 2013.

Slated to Launch by 2018

In the Spring of 2013, the four European satellites should be able to provide for the first time their first waypoint. The in-orbit validation phase will be followed by the deployment of the remaining satellites and Galileo should be fully operational by 2018 or 2019 at the very latest. These type of projects are prone to delays so it’s currently impossible to fix a 100% confirmed date on the official launch.

The four satellites currently in orbit were built by a consortium led by EADS Astrium Germany and assembled in Rome by Thales Alenia Space.

IN TREND: Space Travel and Exploration - Dreaming About the Future of Space Tourism

Make sure to keep reading and feel free to contact us anytime.

*by andreascy*