The present discussion will be limited to four conjectural models of the atmosphere of Mars. For purposes of this report, consideration of each model will be limited to an altitude of 56 km. Computations for the higher altitudes will be performed with the electronic computer program now being ...
Electrostatic precipitator dust density measurements in a Mars-like atmosphereMars atmospheric in-situ resource utilization processes will require dust filtration of large gaseous volumes. An electrostatic precipitator capable of operating in the Martian environment is under development to meet this need. We...
It is interesting that Mars’ atmosphere is very tenuous, even at the surface, and also exhibits large daily variations in wind speed from day to night (Chamberlain and Hunten, 1987). Thermospheric wind speeds for earth easily reach 30% of the speed of sound on a daily basis whereas, at...
Without its atmosphere, the temperature and pressure on Mars steadily dropped. As the temperature lowered, the surface water froze, and without the pressure of the atmosphere, liquid water boiled away while any ice not locked underground sublimated into vapor. These processes are ongoing, and today...
Without its atmosphere, the temperature and pressure on Mars steadily dropped. As the temperature lowered, the surface water froze, and without the pressure of the atmosphere, liquid water boiled away while any ice not locked underground sublimated into vapor. These processes are ongoing, and today...
If the density of an asteroid is 9,000 \; kg/m^3 and its volume is 3.4 \times 10^9 \; m^3, what is its mass? If an object has a mass of 17 kg, what is the approximate weight on earth? What is the total mass of the Earth's atmosphere (in kg)? The ra...
Those measurements also demonstrated the large variability of the gravity-wave amplitudes with season, local time, latitude and longitude. The Mars Atmosphere and Volatile Evolution (MAVEN) mission to Mars [Jakosky et al., 2015], operating since 2014, is dedicated to studying the upper atmosphere...
A diagram to determine the evaporation status of extrasolar planets. Astron. Astrophys. 461, 1185–1193 (2007) Article ADS CAS Google Scholar Vidal-Madjar, A. et al. An extended upper atmosphere around the extrasolar planet HD209458b. Nature 422, 143–146 (2003) Article ADS CAS Google ...
In the final few minutes of a spacecraft landing it is moving at hypersonic speeds through many layers of atmosphere. Knowing the air density outside of the vehicle can have a substantial effect on its angle of descent and ability to hit a specific landing spot. But air density sensors that...
Planetary Atmosphere Wind Tunnel Tests on Aerodynamic Characteristics of a Mars Airplane Scale Model Low-density wind tunnel tests are carried out using a 1/5-scale model to evaluate the aerodynamic performance of a Mars airplane at low Reynolds numbers (R... M Anyoji,M Okamoto,H Hidaka,......