Results 131 to 140 of about 7,767,873 (255)

A Dormant Captured Oort Cloud Comet Awakens: (18916) 2000 OG44

The Astrophysical Journal Letters
We report the discovery of activity emanating from (18916) 2000 OG _44 (alternately designated 1977 SD), a minor planet previously reported to be both an extinct comet and an asteroid on a cometary orbit. We observed 2000 OG _44 with a thin tail oriented
Colin Orion Chandler, William J. Oldroyd, Chadwick A. Trujillo, Dmitrii E. Vavilov, William A. Burris   +4 more
doaj   +1 more source

Chaotic motion in a comet disk beyond Neptune - The delivery of short-period comets

The Astronomical Journal, 1989
Recent Monte Carlo simulations have demonstrated that a source with a spherical distribution of orbital angular momenta such as the Oort Cloud cannot give rise to the highly flattened distribution of short-period comets. It was also demonstrated that the problem of delivery could be resolved if short-period comets originate in a low inclination disk of
openaire   +1 more source

Assessment of early-modern observations of comets and supernovae: Focus on pre-telescopic European astrometric and physical data [PDF]

, 2004
The two-century period prior to the publication of Newton's Principia (first edition 1687; third edition 1726) was most important in terms of the radical changes that occurred in the observation, perception, and understanding of celestial objects that in
Green, Daniel W. E., Green, Daniel W E
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From Flybys to Sample Return: A Review of Space Probes and Robotic Sampling Technologies for Small Bodies

Journal of Field Robotics, Volume 43, Issue 7, Page 4475-4514, October 2026.
ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang, Hao Zhou, Dalin Zhou, Zhaojie Ju   +3 more
wiley   +1 more source

Untreated Hair Dye Effluents Enter the Environment: Are They a Threat to Human Health?

Environmental Toxicology, Volume 41, Issue 10, Page 998-1010, October 2026.
ABSTRACT The effluents generated during the process of hair dyeing exhibit a complex composition, comprising chemical compounds with varying toxicity levels. While the adverse impact of hair dyes on human health is acknowledged, there is a notable absence of studies addressing the toxicity associated with effluents produced during these activities. The
Letícia Cristina Gonçalves, Matheus Mantuanelli Roberto, Adriana Fabiana Corrêa da Silva, Maria Aparecida Marin‐Morales   +3 more
wiley   +1 more source

Prediscovery Activity of New Interstellar Object 3I/ATLAS: Rapid Brightening from 6 to 4 au

The Astrophysical Journal Letters
We report on the prediscovery observations and constraints of the new interstellar comet 3I/2025 N1 (ATLAS), made by the Zwicky Transient Facility, for the inbound leg of the comet out to a heliocentric distance of r _h  = 17 au, or approximately a year ...
Quanzhi Ye, Michael S. P. Kelley, Henry H. Hsieh, Eric C. Bellm, Tracy X. Chen, Richard Dekany, Andrew Drake, Steven L. Groom, George Helou, Shrinivas R. Kulkarni, Thomas A. Prince, Reed Riddle   +11 more
doaj   +1 more source

Evaluating School‐Based Obesity Prevention Interventions in 6‐ to 12‐Year‐Old Children: A Scoping Review of All Reported Outcomes and Expert Consultation

Obesity Reviews, Volume 27, Issue 10, October 2026.
ABSTRACT Introduction This scoping review aims to identify all outcomes reported in school‐based obesity prevention interventions in childhood. It serves as an essential first step towards developing an internationally agreed‐upon Core Outcome Set (COS), which defines what should be measured in all school‐based childhood obesity prevention studies ...
Teatske M. Altenburg, Lotte W. de Vries, Iris J. Grooten, Janneke van 't Hooft, Arend W. van Deutekom, Tessa Roseboom, Erica van den Akker, Michael Duncan, Ulf Ekelund, John J. Reilly, Lisa Reilly, Annette Stafleu, Martyn Standage, Mai J. M. Chinapaw, Deirdre M. Harrington   +14 more
wiley   +1 more source

Main Belt Comets: Status Report of the Monitoring Large Programme at ESO [PDF]

, 2012
A status report of the 4-years long ESO Large Program, aimed at monitoring and characterizing Main Belt Comets. The program is 50% completed. Some of the MBCs were observed active.
Hainaut, O. R., Mueller, B. E. A., Tozzi, G. P., CARRARO, GIOVANNI, Hsieh, H., Boehnhardt, H., Kleyna, J., Meech, K. J., Protopapa, S., Licandro, J., Buie, M., Lowry, S., Snodgrass, C.   +12 more
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Exploring the Anticancer Potential of Schiff Base Complexes: A Mini‐Review

ChemMedChem, Volume 21, Issue 17, 14 September 2026.
Schiff base metal complexes as promising anticancer agents: highlighting DNA interactions, cytotoxicity, molecular targets, and mechanisms of cancer cell death. Schiff bases are well known for their ability to form stable coordination compounds with several transition metals, making them valuable for medicinal chemistry purposes.
Atif Ahmad, Anam, Marcos V. Palmeira‐Mello, Sabir Khan, José Clayston Melo Pereira   +4 more
wiley   +1 more source

The Origin of Comets

, 1964
Astronomers find evidence that comets may have been formed in about the same region of the solar system as ...
Staff,
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