Astronomy Test Study Flashcards
The human body is made of…..?
Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus, etc.
What is a black hole?
A region of space having a gravitational field so intense that no matter or radiation can escape.
Due to the Doppler Shift, stars are slightly __________ as they approach.
Blue
Due to the Doppler Shift, stars are slightly _________ as they move away.
Red
What is the force responsible for forming the structure of the Universe?
Gravity
What is a nebula?
A huge cloud of dust and gas where stars are born.
Element with the highest percentage in the human body?
Oxygen
What is a supernova?
A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
What is a light-year?
The distance that light travels in one year.
What is an astronomical unit?
The average distance between the Earth and the Sun.
What is fusion?
Nuclear fusion occurs between two atomic nuclei to form a bigger nucleus that releases energy; it occurs in the sun, stars, and on Earth.
What is a spectroscope?
A spectroscope collects the light from distant stars and separates that light into bands of different colors; by studying these bands, astronomers identify the elements/temperature of a star.
What is the Big Bang Theory?
Approximately 13.7 billion years ago, the contents of the universe were compressed under extreme pressure, temperature, and density in a very tiny spot. The universe rapidly expanded, and matter began to come together and form galaxies.
The sun is currently a….?
Main sequence Star.
A star begins as a ball of gas and dust pulled together by…?
Gravity
What are the life cycle stages of a Low mass star?
- Nebula
- Protostar
- Main Sequence
- Red Giant
- White Dwarf
What is a Neutron Star?
A compressed core of a star that became a supernova.
Rank in order (smallest to largest) galaxy, the universe, and solar system.
Solar System, Galaxy, Universe.
What is the evidence for the Big Bang Theory?
Red Shift, Cosmic background radiation.
What are the steps of the Big Bang Theory?
1: Hot, Dense State (point of singularity).
2: Expansion.
3: Cooling & Condensing.
4: Elements Formed From Stars.
5: Solar Systems.
What is the Electromagnetic Spectrum?
The complete range of electromagnetic waves is placed in order of increasing wave length and frequency.
What are the life cycle stages of a High Mass star?
- Nebula
- Protostar
- Main Sequence
- Super Red Giant
- Supernova
- Neutron Star or Black Hole.
What is a “baby star”?
Protostar
Red giant - Low or High Mass?
Low mass
The life cycle of a star depends on whether it’s a…?
High or Low mass star.
Super Red Giant - Low or High Mass?
High Mass
Main Sequence stars are mostly made of…?
Hydrogen & Helium
What happens to a star when only iron is left in its core?
Supernova
(True or False) - A black hole forms when a large star collapses and comes to the end of its life.
True
(True or False) - Out solar system is formed from a cloud of gas and dust called a protostar.
False - Nebula not Protostar
