AstronautA person trained to travel in a spacecraft
Definitions:
A person who is trained to travel in a spacecraft
FearlessWithout fear; brave
Definitions:
Without fear; bold or brave
PerilousFull of danger or risk
Definitions:
Full of danger or risk
CourageThe ability to do something that frightens one
Definitions:
The ability to do something that frightens one; bravery
ExperimentalInvolving a new idea, method, or device
Definitions:
Involving a new idea, method, or device that is a test to see if it is suitable or effective compared to those that are already used
PioneeringIntroduce or be the first to use or apply (a new method, area of knowledge, or activity)
Definitions:
Introduce or be the first to use or apply (a new method, area of knowledge, or activity)
AdrenalineA hormone secreted by the adrenal glands that increases rates of blood circulation, breathing, and carbohydrate metabolism and prepares muscles for exertion
Definitions:
A hormone secreted by the adrenal glands that increases rates of blood circulation, breathing, and carbohydrate metabolism and prepares muscles for exertion