7 Terms
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Space flight
Of or relating to the act of voyaging outside the Earth's atmosphere and into outer space, and the science involved in achieving it.
Industry: Aerospace
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Space flight
Inferior conjunction
Aerospace; Space flight
Alignment of Earth, sun, and an inferior planet on the same side of the sun.
Inferior planet
Aerospace; Space flight
Planet which orbits closer to the Sun than the Earth's orbit.
Inclination
Aerospace; Space flight
The angular distance of the orbital plane from the plane of the planet's equator, stated in degrees.
Intermediate frequency (IF)
Aerospace; Space flight
In a radio system, a selected processing frequency between RF (Radio Frequency) and the end product (e.g. Audio frequency).
Horizon
Aerospace; Space flight
The line marking the apparent junction of Earth and sky. For the technical definition, please follow this link to the U.S. Naval Observatory's Astronomical Applications.
Hohmann transfer orbit
Aerospace; Space flight
Interplanetary trajectory using the least amount of propulsive energy. See Chapter 4.
High-gain antenna (hga)
Aerospace; Space flight
An antenna onboard of a spacecraft with a focused, narrow radiowave beam width. This narrow beam width allows more precise targeting of the radio signal - also known as a directional antenna.
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