Results 111 to 120 of about 2,935 (226)

Models for Astronomy Laboratory Investigations

, 1967
Because of the long periods of sky observations required to collect data and the fact that many of the observations must be made at night, most of the conventional astronomy laboratory experiments are fine for the individual student project but are less ...
Johnston, Paul
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The Ultimate Mountaintop: Astronomy Aboard Stratospheric Balloons

, 2000
As funding, for astronomy dwindles and the competition for observation time heats up, more astronomers may turn to balloons. Far above the Keck telescope on Hawaii's Mauna Kea, higher still than the hostile snowcapped peaks of Mt. Everest, there exists a
Wanjek, Christopher, White, Nicholas E.
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Astronomy and astrophysics abstracts: literature 1997, part 1

, 1998
Astronomy and Astrophysics Abstracts is devoted to the recording, summarizing and indexing of astronomical publications throughout the world. Two volumes are scheduled to appear per year.
Burkhardt, G, Esser, U, Schmadel, L, Heinrich, I, Wielen, R, Hefele, H, Matas, V, Hofmann, W, Zech, G   +8 more
core   +1 more source

Istihsan in Determination of the Lunar Month: Jurisprudential Flexibility for Harmonizing the Ummah

Sinthop
This article examines the role of Istihsan as a method of Islamic jurisprudential flexibility in determining Islamic law, particularly regarding the beginning of the lunar month, and reviews the positions of the four prominent schools of jurisprudence ...
Geubrina Rizky Ananda Sy, Nur Mahmudi Qiromi, Mahsun Mahsun, Amir Tajrid   +3 more
doaj   +1 more source

Direct observation of ion cyclotron damping of turbulence in Earth’s magnetosheath plasma

Nature Communications
Plasma turbulence plays a key role in space and astrophysical plasma systems, enabling the energy of magnetic fields and plasma flows to be transported to particle kinetic scales at which the turbulence dissipates and heats the plasma.
A. S. Afshari, G. G. Howes, J. R. Shuster, K. G. Klein, D. McGinnis, M. M. Martinović, S. A. Boardsen, C. R. Brown, R. Huang, D. P. Hartley, C. A. Kletzing   +10 more
doaj   +1 more source

Displaced solar sail orbits : dynamics and applications

, 2010
We consider displaced periodic orbits at linear order in the circular restricted Earth-Moon system, where the third massless body is a solar sail. These highly non-Keplerian orbits are achieved using an extremely small sail acceleration.
Simo, J., Simo, Jules, McInnes, Colin, McInnes, Colin R., McInnes, C.R.   +4 more
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Opportunities for asteroid retrieval missions

, 2013
Asteroids and comets are of strategic importance for science in an effort to uncover the formation, evolution and composition of the Solar System. Near-Earth Objects (NEOs) are of particular interest because of their accessibility from Earth, but also ...
Daniel García Yárnoz, Sanchez Cuartielles, Joan-Pau, Colin R. McInnes, Garcia Yarnoz, Daniel, McInnes, Colin, Yárnoz, Daniel García, Joan-Pau Sanchez, McInnes, Colin R.   +7 more
core   +1 more source

JWST MIRI MRS Observations of T Cha: Discovery of a Spatially Resolved Disk Wind

The Astronomical Journal
Understanding when and how circumstellar disks disperse is crucial to constrain planet formation and migration. Thermal winds powered by high-energy stellar photons have long been theorized to drive disk dispersal.
Naman S. Bajaj, Ilaria Pascucci, Uma Gorti, Richard Alexander, Andrew Sellek, Jane Morrison, Andras Gaspar, Cathie Clarke, Chengyan Xie, Giulia Ballabio, Dingshan Deng   +10 more
doaj   +1 more source

Fiftieth Lunar and Planetary Science Conference 2019

, 2019
The 50th Lunar and Planetary Science Conference was held at The Woodlands Waterway Marriott Hotel and Convention Center, The Woodlands, Texas, March 18–22, 2019.

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Solar sail dynamics in the three-body problem: homoclinic paths of points and orbits

, 2008
In this paper we consider the orbital previous termdynamicsnext term of a previous termsolar sailnext term in the Earth-Sun circular restricted three-body problem. The equations of motion of the previous termsailnext term are given by a set of non-linear
Waters, Thomas, McInnes, Colin, Waters, Thomas J., McInnes, Colin R.   +3 more
core   +1 more source