Galactic Lexicon: [E]

Earth

Pronunciation:
erth
Definition:
The third planet from the sun, the only known planet capable of supporting life, and the planet on which humans live.
Sample Sentence:
The Earth orbits the sun once every 365.24 days.

A simple illustration of planet Earth, cropped from a NASA image, against a white background.
Credit: Image created by DonkeyHotey

Eclipsing Binary

Pronunciation:
ih-KLIP-sing BIE-nuh-ree
Definition:
A binary star system in which the two stars periodically pass in front of one another as seen from Earth, causing a variation in brightness.
Sample Sentence:
Eclipsing binary systems provide valuable information about the physical properties of stars, such as their sizes and masses.

An illustration of an eclipse in a VV Cephei binary star system, composed of a supergiant and a brilliant blue star. The light curve in the image shows very little change when the blue star passes in front of the supergiant. Credit: Image created by Omnidom 999

Electron

Pronunciation:
ih-LEK-tron
Definition:
A negatively charged subatomic particle that orbits the nucleus of an atom.
Sample Sentence:
Electrons are responsible for the chemical and physical properties of atoms, including their ability to form chemical bonds with other atoms.

An illustration of an electron, a subatomic particle with a negative charge that orbits the nucleus of an atom. This visualization shows an electron in motion around the nucleus of an atom. Credit: Image created by Free SVG

Engineer

Pronunciation:
en-juh-neer
Definition:
A person who designs, builds, or maintains machines, structures, or systems.
Sample Sentence:
The engineers at the company worked together to design a new and innovative product.

Caption: An astronaut engineer performs maintenance work in space, holding parts while floating outside the spacecraft. This image was taken by a NASA astronaut and digitally enhanced by Rawpixel Ltd. Credit: Image provided by NASA

Ephemeris

Pronunciation:
ih-FEM-uh-ris
Definition:
A table or chart that shows the predicted positions of astronomical objects in the sky at a given time or times.
Sample Sentence:
The astronomer consulted the ephemeris to determine when the comet would be visible from Earth.

This ephemeris covers one year and includes the regular planets, as well as the Lunar Nodes, Chiron, and Lilith. T
Credit: Image sourced from the Swiss Ephemeris for Users website

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