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" Dark matter is one of the dominant constituents of the universe, which piled up in certain parts of the universe due to gravity, and in those regions, galaxies were formed. It is the unseen thing that holds the universe together. "

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" Black holes are enigmatic astronomical objects, areas where the gravity is so immense that it has warped spacetime so that not even light can escape. "

Priyamvada Natarajan

Escape

Black

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" We need to make sure that the Voyager probes carrying a record of human civilization speeding beyond our solar system remain an introduction to the world that sent them and not an epitaph for a civilization that caused its own ruin. "

" My students may have dexterity with the equations they're required to know, but they lack the capacity to apply their knowledge to real-life problems. This critical shortcoming appears in high school and possibly in elementary grades - long before college. "

" We cannot explain the phenomenon of gravitational lensing without general relativity, and this is where MOND spectacularly fails. "

" In an era of ever-increasing globalization, what it takes to become and remain a science superpower has fundamentally changed. "

" Data suggest that central black holes might play an important role in adjusting how many stars form in the galaxies they inhabit. For one thing, the energy produced when matter falls into the black hole may heat up the surrounding gas at the center of the galaxy, thus preventing cooling and halting star formation. "

" The deep fascination with the mysterious, and the impulse to seek and locate ourselves in the cosmic context, seems to be imprinted in our DNA and psyches. "

" The invisible and unseen has always fascinated us humans. "

Priyamvada Natarajan

Unseen

Always

" We already have a pretty good knowledge of the universe's mass-energy content, so if we can get a handle on its geometry, then we will be able to work out exactly what the fate of the universe will be. "

" Individuals reporting on their own experience with particular therapies would provide first-hand accounts that could be considered in the improvement of drug design. "

" As an astrophysicist, my research work involves mapping dark matter, the elusive substance that accounts for about a quarter of our universe. "

" Science is evidence-based and provides a continuing understanding of complex natural phenomena. Our understanding is constantly evolving and continually improving. "

" Scientific knowledge is, by its nature, provisional. This is due to the fact that as time goes on, with the invention of better instruments, more data and better data hone our understanding further. Social, cultural, economic, and political context are relevant to our understanding of how science works. "

" The early universe was a dusty place, and the UV radiation from the hot, young black holes and stars would get enshrouded by dust, re-radiated, and scattered into red wavelengths like infra-red, causing these objects to remain obscured. "

" My own day-to-day observations confirm that many Americans can barely make change. At the supermarket where I buy groceries, I've watched more than one encounter at the cash register where both customer and clerk are befuddled at the prospect of double-checking the sums. "

" The precise effects of lensing depend on the mass of the lens, the structure of space-time, and the relative distance between us, the lens, and the distant object behind it. It's like a magnifying glass, where the image you get depends on the shape of the lens and how far you hold it from the object you're looking at. "

" I am a professor of astronomy and physics at Yale University, where I teach an introductory class in cosmology. I see the deficiencies that first-year students show up with. "

" The existence of dark matter and dark energy are inferred from observations! They are not theoretical constructs. Though invisible, both reveal their presence through the effects that they exert on motions of celestial bodies and in the case of dark matter - the bending of light as well. "

" I fell in love with the night sky when I first looked through a telescope as a young girl growing up in Delhi. "

" Perhaps more than English or history, STEM subjects require an enormous amount of foundational learning before students can become competent. "

" Everyone acknowledges that there is a political part to tenure, but no one likes to admit it. "

" No one wants to walk across a crowd-sourced bridge. "

" We must face up to a difficult paradox: The U.S. can maintain a leading position in science only by giving up its desire to be number one. "

" We knew from theoretical models that mergers of massive, gas-rich galaxies were more frequent in the past. Now we've found that these mergers are responsible for producing both the nearby obscured quasar population and their distant cousins. "

Priyamvada Natarajan

Responsible

Cousins

" In addition to a well-funded school system, we need to encourage and exploit innovative approaches for learning outside the classroom. "

" We scientists have an obsession with unification, a grand synthesis. And dark matter is an irritating missing piece. "

" Evidence-based reasoning underpins all scientific thinking, and it involves testing hypotheses or theories against data. Validating a theory requires replicable measurements from independent groups with different equipment and methods of analysis. Convergence of evidence is critical to the acceptance of a scientific idea. "

" I am obsessed with trying to understand why there is such rampant denialism of science in our country. I find this exuberant irrationalism extremely disturbing. And this is particularly troubling, because I am a professional scientist. "

" As Congress battles over spending and cost cutting, it is imperative that funding for math education programs does not fall victim. "

" If you know the shape of the lens and the image you get, you can work out the path that light followed between the object and your eye. "