Results 51 to 60 of about 28,676 (218)

Evaluating Investment in Space Programs: A Case for Theoretical Pluralism

Financial Accountability &Management, Volume 42, Issue 1, Page 19-35, February 2026.
ABSTRACT A perennial question repeatedly asked since the early Mercury (USA) and Salyut (then Soviet Union) space programs has been variations on the theme of “how can the cost of space exploration be justified?” This question—which in broad terms constitutes the research question considered in this paper—continues to be directed toward space agencies ...
Basil P. Tucker, Hank C. Alewine
wiley   +1 more source

The Web of Micro-Structures in IC 4593

Galaxies, 2020
In addition to large-scale structures, planetary nebulae (PNe) show small-scale structures that emit mainly in low-ionization species such as [N ii], [S ii], [O ii], and [O i], known as LISs.
M. Belén Mari, Denise R. Gonçalves, Stavros Akras   +2 more
doaj   +1 more source

The Origin of the Consistent Planetary Nebula Luminosity Function Bright-end Cutoff

The Astrophysical Journal, 2023
The [O iii ] 5007 Å line is typically the brightest line in planetary nebula (PN) spectra. Observations show that the brightest [O iii ] 5007 Å PN in a galaxy—the planetary nebula luminosity function (PNLF) bright-end cutoff—is surprisingly independent ...
Philippe Z. Yao, Eliot Quataert
doaj   +1 more source

X-Ray Emission from the Pre-Planetary Nebula Henize 3-1475 [PDF]

, 2003
We report the first detection of X-ray emission in a pre-planetary nebula, Hen 3-1475. Pre-planetary nebulae are rare objects in the short transition stage between the Asymptotic Giant Branch and planetary nebula evolutionary phases, and Hen 3-1475 ...
Blackman, Eric G., Frank, Adam, Kastner, Joel H., Morris, Mark, Sahai, Raghvendra   +4 more
core   +3 more sources

Formation of Asteroid (16) Psyche by a Giant Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Asteroid (16) Psyche is the largest likely metal‐rich asteroid in the Solar System and the target of the NASA Psyche mission. The mission aims to determine whether the asteroid is the core of a differentiated planetesimal that lost its mantle via a giant impact.
Saverio Cambioni, Benjamin P. Weiss, Namya Baijal, Robert Melikyan, Erik Asphaug, John B. Biersteker, Richard P. Binzel, William F. Bottke, Samuel W. Courville, Linda T. Elkins‐Tanton, David J. Lawrence, José M. G. Merayo, Carol A. Raymond, Mark A. Wieczorek, Maria T. Zuber   +14 more
wiley   +1 more source

Detection of CH in the O-rich Planetary Nebula NGC 6302

The Astrophysical Journal
Planetary nebulae are sites where ejected stellar material evolves into complex molecules, but the precise physical conditions and chemical routes that govern these processes are unclear.
Charmi Bhatt, Jan Cami, Els Peeters, Nicholas Clark, Paula Moraga Baez, Kevin Volk, G. C. Sloan, Joel H. Kastner, Harriet L. Dinerstein, Mikako Matsuura, Bruce Balick, Kathleen E. Kraemer, Kay Justtanont, Olivia Jones, Raghvendra Sahai, Isabel Aleman, Michael J. Barlow, Jeronimo Bernard-Salas, Joris Blommaert, Naomi Hirano, Patrick Kavanagh, Francisca Kemper, Eric Lagadec, J. Martin Laming, Frank Molster, Hektor Monteiro, Anita M. S. Richards, N. C. Sterling, Maryam Torki, Peter A. M. van Hoof, Jeremy R. Walsh, L. B. F. M. Waters, Roger Wesson, Finnbar Wilson, Nicholas J. Wright, Albert A. Zijlstra   +35 more
doaj   +1 more source

Multiple outflows in the planetary nebula NGC 6058

, 2013
We present narrow-band [O III]lambda5007 and H-alpha images, as well as long-slit high-resolution echelle spectra of the planetary nebula NGC 6058. Our data reveal that NGC 6058 is a multipolar planetary nebula of about ~45 arcsec in extent and formed by
Ayala, S., Contreras, M. E., Guillén, P. F., Miranda, L. F., Ortiz-Ambriz, A., Vázquez, R., Zavala, S.   +6 more
core   +1 more source

Morphology and Composition of the Helix Nebula [PDF]

, 1999
We present new narrow-band filter imagery in H-alpha and [N II] 6584 along with UV and optical spectrophotometry measurements from 1200 to 9600 Angstroms of NGC 7293, the Helix Nebula, a nearby, photogenic planetary nebula of large diameter and low ...
Bachiller R., Burke V. M., Butler K., Clegg R. E. S., Galavis M. E., Gorny S. K., K. B. Kwitter, Kingsburgh R. L., Lennon D. J., Mendez R. H., Mendoza C., Napiwotzki R., Nussbaumer H., O'Dell C. R., Peimbert M., Peimbert M., Pequignot D., R. B. C. Henry, R. J. Dufour, Schaller G., Seaton M. J., Storey P. J., van den Hoek L. B., Wiedemann V.   +23 more
core   +2 more sources

Rural Root Shock

Antipode, Volume 58, Issue 1, January 2026.
Abstract This article expands social psychiatrist Mindy Fullilove's characterisation of US postwar urban community root shock in time and space. We explore the impacts of land dispossession and population displacement on Black farming communities and their health from colonial origins on.
Robert G. Wallace, Elsa Calderon, M. Jahi Johnson‐Chappell, Garrett Graddy‐Lovelace, Khaliah D. Pitts, Sam Sharpe   +5 more
wiley   +1 more source

What Can Meteorites Tell Us About the Formation of Jupiter?

AGU Advances, 2021
Gas giants like Jupiter are a fundamental component of planetary systems, but how they formed has been uncertain. Here we discuss how paleomagnetic records in meteorites of the solar nebula may tell us about Jupiter's final growth stage.
Benjamin P. Weiss, William F. Bottke
doaj   +1 more source