EMS

Question 1

Electromagnetic Spectrum

Answer 1

the entire distribution of electromagnetic radiation according to frequency or wavelength

Question 2

Spectroscopy

Answer 2

the branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation.

Question 3

Continuous Spectrum

Answer 3

a spectrum where all wavelengths are present (ROYGBIV)

Question 4

Emission Spectrum

Answer 4

a spectrum produced by a hot gas (black background with bright lines)

Question 5

Absorption Spectrum

Answer 5

a spectrum produced by a cool gas (rainbow background with black lines)

Question 6

Light Year

Answer 6

a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012km (nearly 6 trillion miles).

Question 7

Astronomical Unit

Answer 7

a unit of measurement equal to 149.6 million kilometers (or 93 million miles), the mean distance from the center of the earth to the center of the sun.

Question 8

Astronomy

Answer 8

the branch of science which deals with celestial objects, space, and the physical universe as a whole.

Question 9

Heliocentric

Answer 9

having or representing the sun as the center, as in the accepted astronomical model of the solar system.

Question 10

Geocentric

Answer 10

having or representing the earth as the center, as in former astronomical systems.

Question 11

Perihelion

Answer 11

the point nearest to the sun in the path of an orbiting celestial body(such as a planet)

Question 12

Aphelion

Answer 12

the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.

Question 13

Orbit

Answer 13

the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

Question 14

Ellipse

Answer 14

a geometric shape (oval) describing the shape of a planets orbit.

Question 15

Retrograde Motion

Answer 15

the apparent motion of a planet in a direction opposite to that of other bodies within its system

Question 16

Perigee

Answer 16

the point in the orbit of the moon or a satellite at which it is nearest to the earth.

Question 17

Apogee

Answer 17

the point in the orbit of the moon or a satellite at which it is furthest from the earth.

Question 18

Lunar Crater

Answer 18

bowl-shaped depression, or hollowed-out area, produced by the impact of a meteorite

Question 19

Lunar Mare

Answer 19

large, dark, basaltic plains on Earth’s Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for ‘seas’, by early astronomers who mistook them for actual seas.

Question 20

Lunar Highlands

Answer 20

the lighter, heavily cratered regions of the Moon

Question 21

Lunar Eclipse

Answer 21

an eclipse in which the moon appears darkened as it passes into the earth’s shadow (during full moon)

Question 22

solar Eclipse

Answer 22

an eclipse in which the sun is obscured by the moon (during new moon)

Question 23

Spring Tide

Answer 23

highest tidal range that occurs due to the alignment of Earth, the Moon, & the Sun

Question 24

Neap Tide

Answer 24

lowest tidal range that occurs near the 1st & 3rd Quarter phases of the Moon

Question 25

Solstice

Answer 25

the time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days (about June 21 and December 21).

Question 26

Equinox

Answer 26

the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length (about September 21 and March 21).

Question 27

Vernal Equinox (date)

Answer 27

March Twenty-First

Question 28

Autumnal Equinox (date)

Answer 28

September Twenty-First

Question 29

Winter Solstice (date)

Answer 29

December Twenty-First

Question 30

Summer Solstice (date)

Answer 30

June Twenty-First