Discovering New Worlds- Flashcard 1 Review

Front

What is a protostar?

Back

A protostar is the initial stage in the formation of a star, where gas and dust collapse under gravity to form a dense core that will eventually become a star.

Front

What is nuclear fusion?

Back

Nuclear fusion is the process that occurs in the core of stars, including the Sun, where hydrogen atoms combine to form helium, releasing a large amount of energy.

Front

What event marks the formation of Earth and our solar system?

Back

The formation of Earth and our solar system occurred approximately 4.6 billion years ago.

Front

What is the main sequence phase of a star?

Back

The main sequence phase is the stage in a star's life cycle where it fuses hydrogen into helium in its core, and it is the longest phase in a star's life.

Front

What do main sequence stars primarily use for nuclear fusion?

Back

Main sequence stars primarily use hydrogen for nuclear fusion.

Front

What is a red giant?

Back

A red giant is a late stage in the life cycle of a star, where it expands and cools after exhausting the hydrogen in its core.

Front

What is a supernova?

Back

A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle, often resulting in the formation of a neutron star or black hole.

Front

What is a white dwarf?

Back

A white dwarf is the remnant core of a star that has exhausted its nuclear fuel and shed its outer layers, typically very dense and hot.

Front

What are stromatolites?

Back

Stromatolites are layered structures formed by the activity of microorganisms, particularly cyanobacteria, and are among the oldest known fossils.

Front

What is the significance of the formation of the oldest known rocks?

Back

The formation of the oldest known rocks provides evidence of the early conditions on Earth and the processes that shaped its surface.