Quiz 2 Flashcards
are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. The age, distribution, and composition of the this in a galaxy trace the history, dynamics, and evolution of that galaxy. Moreover, those are responsible for the manufacture and distribution of heavy elements such as carbon, nitrogen, and oxygen, and their characteristics are intimately tied to the characteristics of the planetary systems that may coalesce about them. Consequently, the study of the birth, life, and death of stars is central to the field of astronomy.
Stars
are luminous globe of gases that produces its own heat and light by nuclear reactions (fusion). They are essentially giant balls of exploding gas, which mainly consists of hydrogen and helium.
Stars
Nebula is a cloud of gas (hydrogen) and dust in space. A Star will form from the Nebula, as it is the birthplace of a Star.
STELLAR NEBULA
It is the hot core at the heart of a collapsing cloud formed from nebula due to the gravity that pulled Hydrogen gas together until it spins faster and faster and becomes ignited
PROTOSTAR
starts to form when nuclear fusion occurs at the core of the star, it begins to contract, glow and become stable. Hydrogen is converted into Helium.
MAIN SEQUENCE STARS
Massive star example
Rigel
Average star example
Sun
• Red Giant
• Planetary Nebulae
• White Dwarf
AVERAGE STAR
• Red Super Giant
• Super Nova
*Black hole
*Neutron Star
MASSIVE STAR
• Red Super Giant
• Super Nova
*Black hole
*Neutron Star
MASSIVE STAR
is a luminous giant star of low or intermediate mass in a late phase of stellar evolution.. The appearance of the red giant is from yellow- orange to red in colour.
RED GIANT
represent the final. brief stage in the life of a medium- sized star like our Sun. While consumirig the last of the fuel in its core, the dying star expels a large portion of its outer envelope. This material is then illuminated by the ultraviolet radiation from the stellar remnant, producing glowing clouds of gas that can show complex structure.
Planetary nebulae
Red giant star becomes exhausted of nuclear fuel, the outer material is blown off into space leaving the inert Carbon. The remnant is known as
WHITE DWARF
A more massive main sequence star evolves, cools and expands faster than low mass star and will turn into ______ star, the largest known star. Carbon fusion still occurs and Oxygen formed.
They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous. Betelgeuse and Antares are the brightest and best known _____
RED SUPER GIANT
Is the leftover, or remnant of a massive star in our Milky Way that died 6,500 light-years away. Astronomers and careful observers saw the supernova in the year 1054 amage crede NASA, ESA, J Hester and A. La (Anna State University)
Crab Nebula
Explosion of star or _____ releases large amount of energy. Because of that, elements are dispersed into the space.
is a powerful and luminous stellar explosion. This transient astronomical event occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion. The original object, called the progenitor, either collapses to a neutron star or black hole, or is completely destroyed.
SUPERNOVA
are formed when a massive star runs out of fuel and collapses. The very central region of the star the core collapses, crushing together every proton and electron into a neutron. If the core of the collapsing star is between about 1 and 3 solar masses, these newly-created neutrons can stop the collapse, leaving behind a neutron star. (Stars with higher masses will continue to collapse into stellar-mass black holes.)
Neutron stars
is a region in space where gravity is too strong that no matter can escape from it.
are among the most violent and energetic objects in the universe active galactic nuclei and quasars, which shoot off jets even as they suck in surrounding gas.
BLACK HOLE
All atoms in the universe began as
Hydrogen
Stars go through a natural cycle, much like any living beings. This cycle begins with birth, expands through a lifespan characterized by change and growth and ultimately leads to death
Life cycle of a star
A star originates from a large cloud of gas.
Giant gas cloud
Is a cloud of gas (hydrogen) and dust in space. A star will form from it as it is the birthplace of a star
Nebula
Begins when materials stop falling into the protostar and release tremendous amount of energy
T-tauri phase
