Hubble volume - Wikipedia
In cosmology, a Hubble volume (named for the astronomer Edwin Hubble) or Hubble sphere, Hubble bubble, subluminal sphere, causal sphere and sphere of causality is a spherical region of the observable universe surrounding an observer beyond which objects recede from that observer at a rate greater than the speed of light due to the expansion of ...
The Sphere - Wikipedia
The Sphere (officially Große Kugelkaryatide N.Y., also known as Sphere at Plaza Fountain, WTC Sphere or Koenig Sphere) is a monumental cast bronze sculpture by German artist Fritz Koenig (1924–2017).
[2006.14030] Tidal distortion and disruption of rubble-pile bodies ...
2020年6月24日 · Based on recent advances in modeling rubble piles, we aim to provide a better understanding of the tidal encounter processes through soft-sphere discrete element modeling (SSDEM) and to establish a database of encounter outcomes and the dependencies on encounter conditions and rubble-pile properties.
Mechanical properties of rubble pile asteroids (Dimorphos, …
2024年7月30日 · This study aims to provide important constraints on the mechanical properties of rubble pile asteroids, while also providing insights into rubble pile and binary asteroid formation mechanisms.
Tidal fragmentation as the origin of 1I/2017 U1 (‘Oumuamua)
2020年4月13日 · A soft-sphere discrete-element model is applied to compute the contact forces and torques between granules in the normal, tangential, rolling and twisting directions.
This paper. focuses on the reshaping process of rubble-pile asteroids driven by meteorite impacts. KEYWORDS. asteroids interior structure. geological processes. N-body simulations. gravitational aggregates. A meteorite impacts mesoscale cluster of solid spheres is employed as the principal model for a rubble-pile.
A mesoscale cluster of solid spheres is employed as the principal model for a rubble-pile asteroid, for which little is actually known about their interior structure. We take this simple model as a rough guide to the qualitative aspects of the reshaping processes, and it can reveal, to some degree, the inner workings of rubble-pile asteroids.
Based on recent advances in modeling rubble-pile physics, we aim to provide a better understanding of the tidal encounter processes of rubble piles through soft-sphere discrete element modeling (SSDEM) and to establish a database of encounter outcomes and their dependencies on encounter conditions and rubble-pile properties. Methods.
On the shapes and spins of “rubble pile” asteroids
2009年2月1日 · We examine the shape of a “rubble pile” asteroid as it slowly gains angular momentum by YORP torque, to the point where “landsliding” occurs.
Cohesive forces prevent the rotational breakup of rubble-pile ... - Nature
2014年8月13日 · Cohesive forces in the form of small van der Waals forces between constituent grains have recently been predicted to be important for small rubble piles (ten kilometres across or less), and could...