TSTI Admin No Comments April 2, 2026

dynamic load

Loads that vary with timeThe timeThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More between successive passages of the SunWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More overhead, which is from noon one dayThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More to noon the next dayThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More. Because Earth’s orbitThe oval-shaped path that a spacecraft follows. Orbits come in various shapes and sizes, but each one has a purpose: to let the spacecraft do its job. Higher orbits require more propellant to get a spacecraft there. More around the SunWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More is slightly elliptical, this timeThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More varies slightly during a year. More are dynamic loads.

TSTI Admin No Comments April 2, 2026

dynamic pressure

Atmospheric pressureThe amount of airThe amount of air within a certain volume. Atmospheric density is higher at sea-level and decreases as you go up in altitude. More within a certain volumeThe amount of air within a certain volume. Atmospheric density is higher at sea-level and decreases as you go up in altitude. More. Atmospheric densityThe amount of air within a certain volume. Atmospheric density is higher at sea-level and decreases as you go up in altitude. More is higher at sea-level and decreasesThe amount of air within a certain volume. Atmospheric density is higher at sea-level and decreases as you go up in altitude. More as you go up in altitudeThe amount of air within a certain volume. Atmospheric density is higher at sea-level and decreases as you go up in altitude. More. More on a launch vehicleA rocketA fluid-dynamics concept that says as low-velocity gases pass into the converging part of a nozzle, they accelerate to the speed of sound at the narrowest section (throat). Then, after they pass through the throat, they expand and accelerate to supersonic speeds. This principle is the basis for creating thrust in a thermodynamic rocket. More that takes a payloadAn assembly of spacecraft components that collect, process, store, and transmit payload-mission and bus-housekeeping data. The communication and data-handling subsystem (CDHS) acts as the ears, brain, and mouth of the spacecraft • It has two primary portions — communication and data handling • It translates raw data from the payloads and subsystems into useful information and sends it to the ground system • Commands from ground controllers generally request information from and give specific instructions to individual subsystems More into orbitThe oval-shaped path that a spacecraft follows. Orbits come in various shapes and sizes, but each one has a purpose: to let the spacecraft do its job. Higher orbits require more propellant to get a spacecraft there. More. Launch vehicles contain huge amounts of propellantA type of rocket system that heats a propellant by passing it through a sustained electric arc, then ejects the energized gas through a nozzle. Its specific impulse is high compared to chemical rockets, but its thrust is very low. More that they must burn to accelerateA fluid-dynamics concept that says as low-velocity gases pass into the converging part of a nozzle, they accelerate to the speed of sound at the narrowest section (throat). Then, after they pass through the throat, they expand and accelerate to supersonic speeds. This principle is the basis for creating thrust in a thermodynamic rocket. More through the atmosphereThe reference frame used to analyze a space vehicle’s motion after leaving orbit until it lands. Its origin is at the vehicle’s center of mass at the beginning of re-entry. More and into space. There, […]

TSTI Admin No Comments April 2, 2026

earned value

The value of work done on a project at a given timeThe time between successive passages of the SunWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More overhead, which is from noon one dayThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More to noon the next dayThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More. Because Earth’s orbitThe oval-shaped path that a spacecraft follows. Orbits come in various shapes and sizes, but each one has a purpose: to let the spacecraft do its job. Higher orbits require more propellant to get a spacecraft there. More around the Sun is slightly elliptical, this timeThe time between successive passages of the Sun overhead, which is from noon one day to noon the next day. Because Earth’s orbit around the Sun is slightly elliptical, this time varies slightly during a year. More varies slightly during a year. More. It’s a measure of performance versus timeThe […]

TSTI Admin No Comments April 2, 2026

Eb/No

Eb/NoEb/No is the ratio of the received energy per bit (Eb) to noise power spectral density (No). We use this in place of signal to noise ratio when dealing with digital communication. Friis' Equation can be used to determine the value of this ratio. The required Eb/No needed for a given link depends on the modulation technique chosen and the number of lost bits you are willing to live with. More is the ratio of the received energyWe use the angle of incidenceWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More, θ, to determine how much solarWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More energyWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More hits a solarWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More panelWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More. This angle lies between a line perpendicular to the cell and the Sun line. More per bit (Eb) to noise powerOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More spectral density (No). We use this in place of signal […]

TSTI Admin No Comments April 2, 2026

Eccentric anomaly

We define this, E, by circumscribing an elliptical orbitThe oval-shaped path that a spacecraft follows. Orbits come in various shapes and sizes, but each one has a purpose: to let the spacecraft do its job. Higher orbits require more propellant to get a spacecraft there. More with a circle and relating E to mean anomaly by using true anomalyThe angle along the orbital path from perigee to the spacecraft’s position vector. Tells us the location of the spacecraft in its orbitThe oval-shaped path that a spacecraft follows. Orbits come in various shapes and sizes, but each one has a purpose: to let the spacecraft do its job. Higher orbits require more propellant to get a spacecraft there. More. It is the only COEFor the fifth orbital element, we measure the angle along the orbital path between the ascending node and perigee and call it the argument of perigee. We always measure this angle in the direction of spacecraft motion. More that changes constantly even when all […]

TSTI Admin No Comments June 20, 2024

eccentricity

Describes the deviation of a shapeDescribes the deviation of a shape from a perfect circle. A perfect circle has an eccentricityDescribes the deviation of a shape from a perfect circle. A perfect circle has an eccentricity of zero, and an ellipse has an eccentricity between zero and one. More of zero, and an ellipse has an eccentricityDescribes the deviation of a shape from a perfect circle. A perfect circle has an eccentricity of zero, and an ellipse has an eccentricity between zero and one. More between zero and one. More from a perfect circle. A perfect circle has an eccentricityDescribes the deviation of a shape from a perfect circle. A perfect […]

TSTI Admin No Comments April 2, 2026

eclipse

Orbiting spacecraft periodically pass through Earth’s shadowOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipseOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More). During these eclipseOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More periods, the incident solarWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More energyWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More drops to zero, and the solar cells stop producing powerOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More. More (enter eclipseOrbiting spacecraft periodically pass through Earth’s shadowOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More (enter eclipseOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More). During these eclipseOrbiting spacecraft periodically pass through Earth’s shadow (enter eclipse). During these eclipse periods, the incident solar energy drops to zero, and the solar cells stop producing power. More periods, the incident solarWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More energyWe use the angle of incidence, θ, to determine how much solar energy hits a solar panel. This angle lies between a line perpendicular to the cell and the Sun line. More drops to zero, […]

TSTI Admin No Comments April 2, 2026

ecliptic plane

The plane of Earth’s orbitThe oval-shaped path that a spacecraft follows. Orbits come in various shapes and sizes, but each one has a purpose: to let the spacecraft do its job. Higher orbitsThe study of the moving objects under the influence of gravity from another body. Astrodynamicists design orbits and study how gravity affects them. More require more propellantA type of rocket system that heats a propellant by passing it through a sustained electric arc, then ejects the energized gas through a nozzle. Its specific impulse is high compared to chemical rockets, but its thrust is very low. More to get a spacecraft there. More around the Sun. We use it as the fundamental planeOne of four pieces […]

TSTI Admin No Comments April 2, 2026

edema

The abnormal accumulation of fluid in humanHigh-level, short-term radiation exposure, causing more damage to humanHigh-level, short-term radiation exposure, causing more damage to human tissue than the same level spread over a longer time. More tissue than the same level spread over a longer time. More tissue. During space flight, astronauts experience edemaThe abnormal accumulation of fluid in human tissue. During space flight, astronauts experience edema (red puffiness) in their face for the first few days. More (red puffiness) in their face for the first few days.

TSTI Admin No Comments April 2, 2026

effective exhaust velocity

The speedHow fast an object's speed is changing when we apply a force to it. During acceleration, speed increases. During deceleration, speed decreases. More that the energized propellantA type of rocket system that heats a propellant by passing it through a sustained electric arc, then ejects the energized gas through a nozzle. Its specific impulse is high compared to chemical rockets, but its thrust is very low. More mass leaves a rocket engine. For thermodynamic rockets, it is a moderate speed. For electrodynamic rockets, it is a high speed.