Related Experiment Video
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
SOLAR SYSTEM EXPLORATION: NASA Blasted for Rising Costs, Cancellations
Summary
NASA
Area of Science:
- Planetary Science
- Astrophysics
- Space Exploration
Background:
- NASA's recent cancellation of a small asteroid rover mission.
- Concerns within the planetary science community regarding mission funding and scope.
- Previous successes and challenges in outer solar system exploration.
Purpose of the Study:
- To analyze the impact of NASA's project cancellation on the planetary science community.
- To investigate the root causes of escalating costs in U.S. space programs.
- To propose a reevaluation of the U.S. outer solar system exploration strategy.
Main Methods:
- Analysis of community response to the mission cancellation.
- Review of project management and financial data for recent NASA missions.
- Synthesis of expert opinions on future space exploration priorities.
Main Results:
- Widespread criticism from planetary scientists regarding the cancellation.
- Identification of spiraling costs as a major impediment to U.S. space programs.
- A consensus for a comprehensive review of outer solar system initiatives.
Conclusions:
- The cancellation highlights systemic issues in U.S. planetary science funding.
- Urgent need for a strategic reevaluation to ensure the future of outer solar system exploration.
- Collaborative efforts are required to address cost overruns and maintain scientific competitiveness.
Related Concept Videos
Rocket 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...
Rocket 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...
Rocket 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...
Acceleration 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...
Circular 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...
Energy 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...

