13 papers · ranked by Valyu relevance
Roger Angel
The proposed lunar telescope for optical and infrared astronomy aims at very large aperture, 600 m2, at a fundable cost. It comprises an array of 18 separate telescopes, each of 6.5 m aperture. The 200 m diameter array will be located within 1/2° (15 km) of a lunar pole on approximately level ground, with a perimeter…
Vincent L. Fish, Maura Kathleen Shea, Kazunori Akiyama
Very long baseline interferometry (VLBI) from the ground at millimeter wavelengths can resolve the black hole shadow around two supermassive black holes, Sagittarius A* and M87. The addition of modest telescopes in space would allow the combined array to produce higher-resolution, higher-fidelity images of these and…
Pierre Y. Bély, G. D. Illingworth, Jonathan W. Arenberg, Charles M. Atkinson + 14 more
Story Authors: ['Pierre Y. Bély' 'G. D. Illingworth' 'Jonathan W. Arenberg' 'Charles M. Atkinson' 'R. Burg' 'Mark Clampin' 'Lee Feinberg' 'Paul H. Geithner' 'John C. Mather' 'Michael T. Menzel' 'M. E. Nein' 'L. Petro' 'David C. Redding' 'Bernard D. Seery' 'Harald Stahl' 'M. Stiavelli' 'H. S. Stockman' 'S. Willoughby']…
Ryker W. Eads, J. Roger P. Angel
A 20 m space telescope is described with an unvignetted 1° field of view-a hundred times larger in area than fields of existing space telescopes. Its diffraction-limited images are a hundred times sharper than from wide-field ground-based telescopes and extend over much if not all the field, 40 arcmin diameter at 500…
Léon V. E. Koopmans, Rennan Barkana, Mark Bentum, Gianni Bernardi + 26 more
The Dark Ages and Cosmic Dawn are largely unexplored windows on the infant Universe (z ~ 200-10). Observations of the redshifted 21-cm line of neutral hydrogen can provide valuable new insight into fundamental physics and astrophysics during these eras that no other probe can provide, and drives the design of many…
Priya Hasan
The advent of Extremely Large Telescopes ELTs, ground-based optical or infrared observatories with primary mirrors exceeding 20 m heralds a transformative epoch in observational astronomy. This article examines the dawn of this new era and the three upcoming facilities in the optical infrared band the Giant Magellan…
Bhaskar Ahuja, Luca Gentile, Ajeet Kumar, Marco Martorella + 3 more
'Xiaofei Zhang' 'Jianfeng Li' 'Wei Liu'] The growing population of space debris poses significant risks to operational satellites and future space missions, necessitating innovative and efficient tracking solutions. Ground-based radar for space surveillance has been a central area of research since the early Space Age…
Adelaide Ladu, Luca Schirru, Mauro Pili, Gian Paolo Vargiu + 6 more
'Francesco Gaudiomonte' 'Federico Perini' 'Andrea Melis' 'Raimondo Concu' 'Matteo Murgia' 'Manuel Sierra Castañer'] Low-frequency aperture arrays represent sensitive instruments to detect signals from radio astronomic sources situated in the universe. In Italy, the Sardinia Aperture Array Demonstrator (SAAD) consists…
Michaël Werner
In January of 1985, more than 40 years ago, a group of astronomers met with NASA officials to map out the future of NASA space astronomy. Their efforts led to the Great Observatories program, linking four powerful space telescopes to study the heavens in four regions of the spectrum. The successful launch and operation…
A. J. Horton, Lee R. Spitler, Naomi Mathers, Michael Petkovic + 14 more
'Douglas Griffin' 'Simon Barraclough' 'Craig R. Benson' 'Igor Dimitrijevic' 'Andrew Lambert' 'Anthony Previte' 'John Bowen' 'Solomon Westerman' 'Jordi Puig‐Suari' 'Sam Reisenfeld' 'Jon Lawrence' 'Ross Zhelem' 'Matthew Colless' 'Russell Boyce'] Anthony Hortona , Lee Spitlera,b, Naomi Mathersc , Michael Petkovicc …
S. Gallozzi, M. Scardia, M. Maris
A particular attention is given to the problem of crowding of circumterrestrial space by medium/small size orbiting objects. Depending on their altitude and surface reflectivity, their contribution to the sky brightness is not negligible for professional ground based observations. With the huge amount of about 50,000…
Benjamin J. Weiner, Dennis Zaritsky, Pavel Gabor, Buell T. Jannuzi + 8 more
'Victor Gasho' 'Chris E. Johnson' 'Scott Swindell' 'P. Kubánek' 'Nathan Smith' 'David Sand' 'Peter Milne' 'Taras Golota'] The Arizona Robotic Telescope Network (ARTN) project is a long term effort to develop a system of telescopes to carry out a flexible program of PI observing, survey projects, and time domain…
P. Rosati, S. Basa, A. W. Blain, E. Bozzo + 36 more
'L. Christensen' 'A. Ferrara' 'A. Gomboc' 'P. T. O’Brien' 'J. P. Osborne' 'A. Rossi' 'F. Schüssler' 'M. Spurio' 'N. Stergioulas' 'G. Stratta' 'L. Amati' 'S. Casewell' 'R. Ciolfi' 'G. Ghirlanda' 'S. Grimm' 'D. Guetta' 'J. Harms' 'E. Le Floc’h' 'F. Longo' 'M. Maggiore' 'S. Mereghetti' 'G. Oganesyan' 'R. Salvaterra' 'N.…