s Flashcards
Divides the terrestrial and Jovian planets and lies between Mars and Jupiter. Distance of the solar nebula from the protostar
Frost Line
Composition of the Universe
4.6% baryonic matter, 24% cold dark matter, and 71.4% dark energy
“ordinary” matter consisting of protons, electrons, and neutrons that comprise atoms, planets, stars, galaxies, and other bodies.
baryonic matter
Matter that has gravity but does not emit light.
Dark Matter
A source of anti-gravity; a force that counteracts gravity and causes the universe to expand, can explain the observed accelerating expansion of the universe.
Dark Energy
three most abundant elements
Hydrogen, Helium, Lithium
Building blocks of galaxies formed by clouds of gas, and dust in the galaxies.
Star/s
The collision of two interacting particles (two light atomic nuclei) at high temperature, and consequent release of relatively large amount of energy into a single heavy nucleus. Responsible for the energy released by stars.
Thermonuclear reaction
Instabilities within the clouds eventually results into gravitational collapse, rotation, heating up, and transformation to a ____, the core of a future star.
protostar
Stars that fuse hydrogen atoms to form helium atom core.
Main Sequence Stars
The distance a light can travel in a year, unit of length that measures astronomical distances.
lightyear
Cluster of stars, at a large scale may seem homogenous and isotropic, but between clusters is empty space.
Galaxy
Cluster of galaxies
Supercluster
The density, age, and diameter of the universe
4.5 x 10-31 g/cm3, 13.8 billion years old, and at least 91 billion light-years
Enumerate the Theories of the Universe
Expanding Universe, The Flat, Close and Open Universes, Steady State Theory, Big Bang Theory, Inflation Theory, Oscillating Universe Theory, String Theory, M-Theory
Galaxies and clusters of galaxies were flying apart from each other. Proposed by Edwin Hubble in 1929, and predicted by Einstein’s Theory of General Relativity.
Expanding Universe (Theory)
leftover light from the Big Bang, discovered by Arno Penzias and Robert Woodrow Wilson in 1964.
Cosmic Microwave Background (CMB)
Discovered the Cosmic Microwave Background in 1964 accidentally, and won the Physics Nobel Prize in 1978.
Arno Penzias, Robert Woodrow Wilson
Theory proposed in 1948 by Hermann Bondi, Thomas Gold, and Fred Hoyle. New matter is created as the universe expand, therefore maintaining its density.
Steady State Theory
Proposed by Alexander Friedmann and Georges Lemaitre in 1920, the universe 13.8 billion years ago, expanded from a singularity, a tiny, dense, and hot mass, into its present size, and cooler state.
Big Bang Theory
Discovered Big Bang Theory in 1920
Alexander Friedmann and Georges Lemaitre
Evidences that back up the Expanding Universe Theory
Redshift, and Cosmic Microwave Background
Ideas that back up the Big Bang Theory
Einstein’s General Theory of Relativity, The Cosmological Principle
Gravity is the distortion of space-time
Einstein’s General Relativity Theory
Principle that assumes the universe is homogenous and isotropic in averaged or large scales.
The Cosmological Principle
Significant Events that occurred in the Big Bang
Inflationary Epoch, Formation of the Universe, Formation of the Basic Elements, Radiation Era, Matter Denomination, Birth of Stars and Galaxies
How can astronomers estimate the age of the universe?
Estimating the age of the oldest looking stars, and measuring the rate of expansion of the universe
Proposed by Alan Guth, Andrei Linde, Paul Steinhardt, and Andy Albrecht
Inflation Theory
Regarded as the extension of the Big Bang, propose that prior to the Big Bang there was an exponential expansion of the universe, wherein the energy density of the universe was dominated by a constant type of vacuum energy.
Inflation Theory
A theory of the end of the universe, when the density of the universe is high it will eventually collapse in a never ending cycle with the Big Bang.
Big Crunch
This theory of the universe follow the General Theory of Relativity of Einstein, wherein the universe has a positive curvature and expands for a time.
Oscillating Universe Theory
A theoretical framework that the assembly of particle type is replaced by a fundamental building block called a string. Said to make up the universe and vibrate at different frequencies.
String Theory
Key theorist behind the string theory
Gabriele Veneziano
Discovered the Mother of all string theories in 1995
Edward Mitten
The origin of the universe is said to be a result of the contact of two-hyperdimensional brane. Considers 11 space-time dimensions. And makes it look like each string theory are in different physical context.
M-Theory
What makes up the Solar System
Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, dwarf planet such as Pluto, satellites, comets, asteroids, and minor bodies.
Where does the Asteroid Belt lie?
Between Mars and Jupiter
Called as smaller asteroids, and “failed planets”
Meteoroids
Lies beyond Neptune (30-50AU), composed of rocky and icy bodies.
Kuiper Belt
Outer boundary of the solar system, composed of mostly icy objects
Oort Cloud
Where the Solar System is located
Milky Way
How many years does it take for the Solar System to make one revolution around the galactic center
240 million years
How old is the Earth and the Solar System?
4.6 billion years old
Planets that are made up of materials with high melting points, thin to no atmosphere, slow rotation, higher density, and low contents of volatiles.
Inner Planets
Called as “gas giants”, thick atmosphere, low density, rotates faster, fluid interiors rich in hydrogen, helium, and ices.
Outer Planets (Jovian Planets)
Celestial body resembling a small planet but lacking in certain criteria to be classified as such.
Dwarf Planets
Criteria to be a planet
- Orbit around the sun 2. Have sufficient mass for self-gravity 3. Has not cleared the neighborhood around it 4. Not a satellite
Made up of rocks, “minor planets”
Asteroids
First known asteroid
Ceres
First known asteroid
Ceres
Composed of mainly ice, and non volatile dust.
Comets
The streak of light when a small piece of cometary and asteroidal material enters the atmosphere at high speeds.
Meteor
Meteoroids that enter and reaches the Earth’s surface is called
Meteorite
Theories of the Origin of the Solar System
- Descartes’ Vortex Theory
- Nebular Hypothesis
- Buffon’s Collision Theory
- Tidal Hypothesis
- Jean-Jeffrey’s Tidal Theory
- Planetesimal Hypothesis
- Sun’s Companion
- Accretion Theory
- Capture Theory
- Protoplanet Hypotheses - Current Hypothesis
A system with an exchange of heat or energy only and no exchange of matter.
Closed System
This includes the Earth’s rocks of the crust, upper mantle, metallic liquid outer core, and solid metallic inner core.
Lithosphere
The composition of the atmosphere
78% Nitrogen, 21% Oxygen, 0.9% Argon, and other trace gases.
Set of all living organisms of Earth, covers all ecosystem. CO2 sink.
Biosphere