Aditya Chopra

Aditya Chopra
Australian National University | ANU · Planetary Science Institute (PSI)

Doctor of Philosophy

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16
Publications
11,974
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255
Citations
Introduction
Aditya Chopra currently works at the Planetary Science Institute (PSI), Australian National University. Aditya does research in Astrobiology.
Skills and Expertise

Publications

Publications (16)
Article
Full-text available
The prerequisites and ingredients for life seem to be abundantly available in the universe. However, the universe does not seem to be teeming with life. The most common explanation for this is a low probability for the emergence of life (an emergence bottleneck), notionally due to the intricacies of the molecular recipe. Here, we present an alterna...
Article
Full-text available
For life-forms like us, the most important feature of Earth is its habitability. Understanding habitability and using that knowledge to locate the nearest habitable planet may be crucial for our survival as a species. During the past decade, expectations that the universe could be filled with habitable planets have been bolstered by the increasingl...
Chapter
Full-text available
We review the most fundamental features common to all terrestrial life. We argue that the ubiquity of these features makes them the best candidates for being features of extraterrestrial life. Other frequently espoused candidates are less secure because they are based on subjective notions of universal fitness, not on features common to all terrest...
Article
Full-text available
Storm disturbance and recovery of the peritidal benthic microbial ecosystem occurs as part of the natural climate regime in Shark Bay. However, tropical cyclone and winter storm frequency and intensity are known to be changing due to climate forcing. Presented here is an analysis of the biogeomorphic response of the benthic microbial ecosystem with...
Chapter
While gazing at the EarthEarth from orbit, some astronauts have described a cognitive shift known as the overview effectOverview effect. Here we describe an analogous biological overview effect produced by looking at the tiny twig of humanity Humanityon the tree of lifeTree of life. We describe the increasingly precise phylogenetic treePhylogenetic...
Article
Full-text available
While gazing at the Earth from orbit, some astronauts have described a cognitive shift known as the overview effect. Here we describe an analogous biological overview effect produced by looking at the tiny twig of humanity on the tree of life. We describe the increasingly precise phylogenetic tree of all life on Earth and how it shows us our place...
Article
Ice-giant-sized planets are the most common type of observed exoplanet, yet the two ice giants in our own solar system (Uranus and Neptune) are the least explored class of planet, having only been observed through ground-based observations and a single flyby each by Voyager 2 approximately 30 years ago. These single flybys were unable to characteri...
Chapter
Full-text available
Fundamental ingredients for the origin of life include specific chemical elements, water, rocky planets, and geochemistry. These ingredients were not present at the big bang ~13.8 billion years ago. Nor were they present when the first stars formed ~13.6 billion years ago. Here we review the element production and fractionation that led from the ho...
Article
Full-text available
The break-up of the supercontinent Pangaea around 180 Ma has left its imprint on the global distribution of species and resulted in vicariance-driven speciation. Here, we test the idea that the molecular clock dates, for the divergences of species whose geographical ranges were divided, should agree with the palaeomagnetic dates for the continental...
Preprint
Full-text available
The breakup of the supercontinent Pangaea over the past ~ 180 million years has left its imprint on the global distribution of species and resulted in vicariance-driven allopatric speciation. Here we test the idea that the molecular clock dates for the divergences of species whose geographic ranges were divided, should agree with the palaeomagnetic...
Article
Full-text available
1.1. What is astrobiology? Astrobiology is the science that seeks to understand the story of life in our universe. Astrobiology includes investigation of the conditions that are necessary for life to emerge and flourish, the origin of life, the ways that life has evolved and adapted to the wide range of environmental conditions here on Earth, the s...
Article
Full-text available
Life is composed of the chemical elements available in its environment, but not in the exact abundances as in the environment. We quantify and interpret these differences in terms of chemical constraints on metabolic pathways.
Article
Full-text available
We quantify and interpret the fractionation of elements that led from the Sun to the Earth, to the Earth's crust, to the environments of life's orign and finally to life itself.
Article
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Examples of biological convergence are more plausibly explained as examples of deep homology. We explain how deep homology undermines the usefulness of terrestrial biological evolution to predict the out-comes of extraterrestrial biological evolution.
Conference Paper
Full-text available
Extant life on Earth shares a common ancestor that probably existed ~4 billion years ago. We describe a novel approach to study the root of the phylogenetic tree of life by measuring the elemental abundances of living organisms and their environment. We discuss the conservation of different elemental ratios across different taxa. It may be possibl...
Conference Paper
Full-text available
As we begin to understand the origin and evolution of life on Earth and investigate the possibility of extraterrestrial life, the need to scientifically approach fundamental questions such as ‘What is Life ?’ increases. In beginning to answer such questions we can look at the ingredients of life on Earth. Here we present an overview of our understa...

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