Light is the fastest traveling thing in the universe. But imagine we were as big enough that whole solar system could seem no big than a pencil then we could easily see light traveling at a slower speed. What I meant here is that light can’t be the fastest traveling thing in the universe. I think more large the thing is more distance it can cover i.e time travels slowly to the Big things whereas faster to the tiny things. It’s just my assumption. Please give me
answer on this. – Nikhil Ghulanawar
Light is not only the fastest traveling particle in the universe, but the speed of light itself represents an upper limit on the speed of any massive object in the universe. The reason that the speed of light is an absolute speed limit is that space and time themselves are really relative. As a person, object, or particle increases in speed, time slows down and lengths get smaller. So even as an observer moves closer to the speed of light, they will always observe light moving exactly at the speed of light. An object that approaches the speed of light also increases in mass as it gets faster, which means that traveling at the speed of light would require the object to have infinite mass! So it’s really Einstein’s theory of relativity that tells us that the speed of light does put an absolute speed limit on the motion in the universe.
– Dr. Jacob Haqq-Misra, BMSIS
Sir, the universe is said to be expanding, but, not with uniform velocity instead it is accelerating. If big bang was a blast then the universe should slow down. Was a bigbang a white whole? – Midhun
If interplanetary and interstellar space were an ecosystem of sorts and if non-planetary based creatures inhabited it and if such a life form or life forms were growing and swarming around tabby’s star and consuming its visible light, what waste products might be produced? Thanks for the speculation! If these “space critters” exist perhaps swarming occurs on such a timescale that very few might be visible to human 2016 technology.
Also, if space critters eat star energy could the waste be stepped down energy such as extremely low frequency. Finally, would the equation be; human recording of Tabby’s star total emitted electromagnetic radiation equals expected emissions from that type of star minus energy used in space critters growth rate? – Jim Hale
For Tabby’s star, this suggests that any orbiting debris, whether cometary fragments or alien technology, should heat up as they absorb starlight and likewise emit waste heat in the form of infrared energy. The same goes for any system in the universe, including all biological life (humans too) and even hypothetical swarming, non-planetary beings. If there are beings floating around Tabby’s star as you suggest, then we should expect to see an excess of heat energy generated as a result.
Now, the amount of waste heat generated might be far less than we could detect, so it remains possible that we just don’t have good enough detection methods to identify the debris/whatever around Tabby’s star. The possibility also remains that whatever is causing the unexplained absorption around Tabby’s star could be (perhaps deliberately?) shifted into even lower wavelengths. Perhaps the waste heat is being reflected away from our vantage point, or perhaps extra work is being done to keep the system cool and beneath our detection threshold. The one thing we do know is that something is blocking light from Tabby’s star, and this energy has to go somewhere. This could tell us something new about how planetary dust works, or it could be energy used for a distant form of extraterrestrial life.
Whatever the explanation, whether weird life or unknown physics, the resolution to the mystery of Tabby’s star will be sure to teach us something new about the universe!
-Dr. Jacob-Haqq Misra, BMSIS
- I am an honors student at OPHS in Kansas City, Missouri. I am researching extraterrestrials for a senior exhibition and would appreciate any research assistance you could provide. My essential question is: Is the existence of extraterrestrials a hoax?
- If Earth were to send out a radio signal, and an ET were to respond, how long would it take for the signals to travel across many light years?
- What changes in the training of astronauts would occur if there was contact made with extraterrestrial beings?
- How many years will it take for Earthly technology to be able to colonize other planets if it is possible at all?
- There is no evidence as of today, April 3, 2016, of the existence of any life beyond Earth.
- Total time taken (years) = 2 x distance in light years + time taken to respond. For example, if one were to send a signal to a planet 100 ly (light years) away, and they take one year to figure out the content of the message and respond to it, it would take a total of: 2 x 100 + 1 = 201 years, to get a response back to the Earth.
- Any change is astronaut training is highly unlikely in case contact is made with extraterrestrials. Since the distance between stars is huge it could take them decades (see answer above) or more to travel to Earth.
- It is possible, but it is against planetary protection laws agreed upon by the international community. Currently, research is done on other planets with the aim of having minimal impact on the environment and avoid contamination as much as possible. If in the future a colonization effort is made, it could take decades to set up basic infrastructure (with current technology) to be able to support human life on that planet.
-Dr. Dimitra Atri, BMSIS
Q: I have always wanted to know more about the prospects of researching on hypothetical types of biochemistry. Also, how far is biochemistry as a subfield used in research for astrobiology? What kind of questions will it help solve or how far is it useful in this field? How would a typical career path be for an astrobiologist? It would be of great help if it were possible to contact somebody in direct association with this field. – Julia Jose
A: Biochemistry as a subfield in Astrobiology: Thank you for your question. Astrobiology is a field of research that encompasses areas of investigation all the way from cosmology to molecular biology, including sciences such as cosmochemistry, geochemistry, biogeochemistry, biochemistry, paleo-biochemistry, and paleobiology, to name some. In this vast breadth of sciences, biochemistry based studies have played a crucial role in, especially, deciphering processes and mechanisms that might have allowed for the transition from chemistry to biology, on the early Earth. THAT includes seminal work that was started by Drs. Stanley Miller and Harold Urey in 1953, which set the stage for prebiotic chemistry and biochemistry based work. In particular, Dr. Leslie Orgel, whom I consider to be one the fathers of the field of prebiotic chemistry, set the tone for the various kinds of studies that biochemists have since then undertaken to decipher the chemical origins of life! Biochemistry based and related studies have enabled delineating several processes including those relevant to understanding how precursors of informational and catalytic molecules might have been formed under certain early Earth conditions. Furthermore, it has shed light on how the resultant monomers could have self-assembled in particular niches to result in RNA, RNA-like molecules, and other small peptides. These are just a few examples from the very long list of things that the field of Astrobiology has ascertained from biochemical studies. Overall, biochemistry based work has enabled to discern several important processes fundamental to the emergence of life on Earth.
Hypothetical types of biochemistry reg.: Work from recent decades, in particular, has significantly strengthened the theory that propounds the plausibility of the existence of pre-RNA worlds. In here, alternate types of biochemistry are thought to have predominated, and these could have resulted as a consequence of certain selective pressures shaping the molecular landscapes prevalent then. Given this, the importance of studying other hypothetical types of biochemistry is implicit as they could enable the characterization of molecular alternatives that would have populated these proto- and pre-RNA worlds (for e.g. you could look up reviews by Dr. Hud and colleagues for more relevant information in this regard).
Career path: If anything, there isn’t a typical career path in Astrobiology, in my opinion! As has been detailed in previous answers, one can do a Ph.D. in Astrobiology related questions after having graduated from any field of science, engineering or even math! As Dr. Sanjoy Som has already alluded, it’s best if you could keep your education broad (see his answer for more details). After a Ph.D., if one wishes to pursue an academic career, one can seek a postdoctoral POSITION in any of the Astrobiology labs depending on their favorite area of research. Other career options typically include pursuing a career related to science education, science policy, science outreach, science communication and science administration. If you have more specific questions, you can email me directly at email@example.com.
Dr. Sudha Rajamani, Faculty at Indian Institute of Science Education and Research (IISER), Pune
Q: If the magnetic field of the Earth protects us from harmful space
radiation, is it theoretically possible to engineer a shuttle with
artificial magnetic field mimicking that of Earth to keep off
radiation for long-term space travel to, say, Mars? – Anonymous
A: There are two components which protect us from harmful charged
particle radiation from space, the earth’s atmosphere, and its magnetic
field. Out of the two, the atmosphere plays a major role in protecting
us from this radiation. More information on this can be found here:
However, in a spacecraft, the only reasonable solution is to generate
a magnetic field which is of much higher magnitude compared to the
earth’s, to compensate for the lack of atmospheric shielding. Such a
shield is currently in development at CERN, which aims to demonstrate
the effectiveness of this technique by the end of the year. More
information can be found here:
-Dr. Dimitra Atri, BMSIS
Q: I read online that a 20 mile wide comet could endanger the Earth in 2030. The claim was made by the author Graham Hancock. Should I be concerned? Here is the website: http://www.express.co.uk/news/
A: Author Graham Hancock claims that debris from the tail of a passing comet will endanger global civilization in the year 2030, but such a suggestion is completely inconsistent with the findings of modern astronomy. Hancock points to the Comet Encke as the source of this destruction to come; however, Comet Encke is a relatively small object measured to be of only about 5 km in diameter, which would be incapable of causing such widespread destruction even if it somehow were to strike Earth. NASA, the European Space Agency, and other organizations keep close watch on the skies for any objects that could threaten civilization or major cities, and astronomers are continually working to discover smaller and smaller objects that could pose risk to humans. Although smaller impacts, such as the Chelyabinsk meteor that entered Russia in 2013, could still catch us off guard, scientists have made detailed enough surveys of the sky to eliminate the possibility that any civilization-destroying impact will happen in at least the next several hundred years.
-Dr. Jacob-Haqq Misra, BMSIS
Q: I have completed my 12th recently. I want to go towards astrobiology and I want to know what subjects should I pursue my Bachelor’s degree? Where in India should I apply for such a focus? And could you also tell of a tentative career path after my Bachelors? – Nikhil Ghulanawar
A: At the moment, there are no dedicated courses available at graduate level for astrobiology in India. However, there are some labs in reputed institutions where active research is being done in astrobiology and related subjects. Here, you can pursue projects at graduate level and can also continue for a PhD. You may have to select the institute depending on your subjects in 12th class. There is the Indian Institute of Science Education and Research (IISER), Pune (prebiotic chemistry/origin of life) and IISER, Kolkata (origins and evolution of life), IIT-Roorkee (prebiotic chemistry), Kumaun University, Nainital (prebiotic chemistry), and Birbal Sahni Institute of Palaeobotany, Lucknow (geology/paleobotany). Astrobiology is a multidisciplinary branch of science and you can start with any stream like biology, chemistry, physics, astronomy, geology, or mathematics and become an astrobiologist.
– Dr. Preeti Nema, BMSIS
Q: I want to be an astrobiologist. I have an immense interest in space exploration. Which particular branch of engineering would you suggest I study which would help me become an astrobiologist? – Pradip Chatterjee
Q: I am a student of class 12 with physics, chemistry, and biology. Is there any scope for me in the field of astrobiology? – Oshin Rawat
A: Hi Pradip/Oshin. I’m so glad you are interested in Astrobiology! Check out my answer to this question on SAGANet. As you’ll see, any kind of discipline will be good to study astrobiology, including engineering. Just make sure your education is broad (for example, as an engineer, take a biology and/or a geology class if you can, and make sure to know programming and statistics). If your university doesn’t offer such courses, check out websites like Coursera to see what is offered. In my view, think of astrobiology as a scaffolding that allows scientists from different disciplines to talk to each other and answer some of the most fundamental questions in science, so it doesn’t really matter what engineering program you follow or which science field you pursue, as long as you gear your research towards astrobiology. Good luck!
– Dr. Sanjoy Som, BMSIS, NASA-AMES