Results 51 to 60 of about 8,239 (171)

Space fantasy: Nagaoka Shusei's contributions to Afrofuturist visual culture

open access: yes
The Journal of American Culture, Volume 48, Issue 1, Page 3-22, March 2025.
Nathan Hesselink
wiley   +1 more source

Observations of Jupiter Family Comet 252P/LINEAR During a Close Approach to Earth Reveal Large Abundances of Methanol and Ethane

open access: yesAstronomical Journal, 2019
We observed short-period comet 252P/LINEAR post-perihelion during its 2016 passage, which presented a favorable opportunity to survey its chemical composition at a close Earth approach (∼0.14 au). We characterized the comet's chemical composition on four
L. Paganini   +5 more
semanticscholar   +1 more source

Elements of cost comparison for planetary missions with advanced propulsion [PDF]

open access: yes
Cost and performance comparisons are made between chemical propulsion and nuclear electric propulsion for planetary missions at Jupiter and beyond. Nuclear rocket comparisons are made for performance only.
Stearns, J. W.
core   +1 more source

The Deflector Selector: A Machine Learning Framework for Prioritizing Hazardous Object Deflection Technology Development

open access: yes, 2018
Several technologies have been proposed for deflecting a hazardous Solar System object on a trajectory that would otherwise impact the Earth. The effectiveness of each technology depends on several characteristics of the given object, including its orbit
Dahlstrom, Eric   +6 more
core   +1 more source

A survey of selected coastal vegetation communities of Florida [PDF]

open access: yes, 1977
A survey of coastal vegetation around Florida was conducted during 1973 and 1974. Seventeen sites were selected and sampled using the transect method to determine species occurrence, relative densities, and habitat development and structure.
Carlton, Jedfrey M.
core  

3D/Biela and the Andromedids: Fragmenting versus Sublimating Comets [PDF]

open access: yes, 2007
Comet 3D/Biela broke up in 1842/1843 and continued to disintegrate in the returns of 1846 and 1852. When meteor storms were observed in November of 1872 and 1885, it was surmised that those showers were the debris from that breakup.
Jenniskens, P., Vaubaillon, J.
core   +2 more sources

Solid rocket technology advancements for space tug and IUS applications [PDF]

open access: yes
In order for the shuttle tug or interim upper stage (IUS) to capture all the missions in the current mission model for the tug and the IUS, an auxiliary or kick stage, using a solid propellant rocket motor, is required.
Ascher, W.   +3 more
core   +1 more source

A method of approximating propellant requirements of low-thrust trajectories [PDF]

open access: yes
Method of approximating propellant requirements of low thrust ...
Zola, C. L.
core   +1 more source

The Active Asteroids

open access: yes, 2015
Some asteroids eject dust, producing transient, comet-like comae and tails; these are the active asteroids. The causes of activity in this newly-identified population are many and varied.
Agarwal, Jessica   +2 more
core   +1 more source

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