Video Experimental Relacionado
Updated: Jul 11, 2026
07:54
Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
Published on: April 3, 2018
EXPLORACIÓN DEL SISTEMA SOLAR: La NASA fue criticada por el aumento de los costos y las cancelaciones
Science (New York, N.Y.)
|September 6, 2007
Resumen
La NASA y la NASA también.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astrofísica es la astrofísica.
- Exploración del espacio Exploración espacial
Sus antecedentes:
- La reciente cancelación por parte de la NASA de una misión de un pequeño rover de asteroides.
- Preocupaciones dentro de la comunidad científica planetaria con respecto a la financiación y el alcance de la misión.
- Éxitos y desafíos previos en la exploración del sistema solar exterior.
Objetivo del estudio:
- Para analizar el impacto de la cancelación del proyecto de la NASA en la comunidad científica planetaria.
- Para investigar las causas profundas de la escalada de los costos en los programas espaciales de EE.UU..
- Proponer una reevaluación de la estrategia de exploración del sistema solar exterior de los Estados Unidos.
Principales métodos:
- Análisis de la respuesta de la comunidad a la cancelación de la misión.
- Revisión de la gestión de proyectos y datos financieros para misiones recientes de la NASA.
- Síntesis de opiniones de expertos sobre las prioridades futuras de la exploración espacial.
Principales resultados:
- Las críticas generalizadas de los científicos planetarios con respecto a la cancelación.
- Identificación de la espiral de costos como un impedimento importante para los programas espaciales de los EE.UU..
- Un consenso para una revisión exhaustiva de las iniciativas del sistema solar exterior.
Conclusiones:
- La cancelación pone de relieve problemas sistémicos en la financiación de la ciencia planetaria de Estados Unidos.
- Necesidad urgente de una reevaluación estratégica para asegurar el futuro de la exploración del sistema solar exterior.
- Se requieren esfuerzos de colaboración para abordar los sobrecostos y mantener la competitividad científica.
Videos de Conceptos Relacionados
01:13Rocket Propulsion in Empty Space - I
The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the rocket's...
01:12Rocket Propulsion In Empty Space - II
The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
01:03Rocket Propulsion in Gravitational Field - II
A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
A rocket's acceleration depends on three major factors, consistent with the equation for the...
A rocket's acceleration depends on three major factors, consistent with the equation for the...
01:24Acceleration due to Gravity on Other Planets
The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
01:16Circular Orbits and Critical Velocity for Satellites
The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
Nicolaus Copernicus (1473-1543) first suggested that the Earth and all other planets orbit the Sun in...
Nicolaus Copernicus (1473-1543) first suggested that the Earth and all other planets orbit the Sun in...
01:11Energy of a Satellite in a Circular Orbit
Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...