VOA慢速英语:Earth’s Arctic Ice Disappears, Scientists Study Nearest Exoplanet

emit – v. to send (light, energy, etc.) out from a source

linear – adj. forming a straight line

solar system – n. our sun and the planets that move around it

minuscule – adj. very small

Goldilocks zone – n. a place in outer space that is not too hot, or too cold and could hold life

exoplanet – n. a planet outside our solar system

radius – n. a measure, taken from a straight line from the center of a circle or sphere to a point on the outer edge