planetary
a. of a planet; having sth. to do with planets

likelihood
n. the degree to which sth. can reasonably be expected to happen; probability

probability
n. the condition of being likely to happen

characteristically
ad. in a characteristic manner

characteristic
n. a special feature or quality that makes sb. or sth. different from others
a. showing a special feature or identity

breathtakingly
ad. astonishingly

exhilarating
a. very exciting; causing happiness

diversity
n. difference; variety

diverse
a.

lifestyle
n. a way of living

commerce
n. the buying and selling of goods; trade 商业

candidate
n. a person or thing that is regarded as being suitable for a particular purpose or as being likely to do or be a particular thing

astronaut
n. a person trained to travel in a spacecraft 宇航员

visitation
n. the act of visiting; visit

remote
a. distant in space or time

inexpensive
a. that which does not cost much; reasonable in price

anthropocentric
a. regarding men as the central fact, and his existence and welfare as the ultimate aim, of the universe 以人类为宇宙中心的

electromagnetic
a. of magnetic force produced by an electric current 电磁的

spectrum
n. a set of bands of colored light in the order of their wavelengths into which a beam of light may be separated; a range of any of various kinds of waves 光谱；波谱

ray
n. a beam of light, heat, electricity or some other form of energy

gamma ray (usu. pl.)
a beam of light of short wavelength which goes through solid objects Y射线，光（量）子

peer
n. an equal in rank, quality or worth

backward
a. late in development

observatory
n. a place from which scientists watch stars and other heavenly bodies 天文台

princess
n. the daughter of a king or queen; a prince's wife 公主；王妃

optimistic
a. tending to see the bright side of things

imply
vt. express, show or mean indirectly; suggest

stellar
a. of or concerning stars

muster
vt. gather or collect; summon

respectability
n. the quality of being respectable

Mars
n. 火星

mission
n. an important task, esp. one that involves traveling abroad

burgeon
vi. bud; grow or develop rapidly

lately
ad. not long ago; recently

manifestation
n. sign of the existence or presence of a person, object or quality

manifest vt.

skeptic
n. person who questions the truth of theories or apparent facts

skeptical
a.

interstellar
n. (placed or moving) between the stars

spacecraft
n. a vehicle used for traveling in outer space 宇宙飞船

ply
v. make regular journeys (between); sail

conveniently
ad. with ease

convenient
a.

colony
n. the area settled by a group of people who leave their country to live in another place 殖民地

premature
a. appearing, happening, or done before the usual, expected or correct time

surmise
vt. guess; suppose

detect
vt. notice or find the presence of

international
a. of or between two or more nations

traffic
n. vehicles, people, ships or aircraft moving along a route

incompletely
ad. not completely; partially

modulation
n. variation of the amplitude, frequency, or phase of the carrier wave in accordance with the sound wave or other signals being sent 调制