Earth and Space Review
Page 1: Overview
Title: Earth and Space Review Study Guide
Page 2: Universe Definition
The Universe: Everything that exists, including matter and energy.
Citation: Q. Greg Parket and Noel Carboni.
Page 3: Composition of the Universe
Matter Composition:
Dark Matter: 26.8%
Atoms: 4.9%
Dark Energy: 68.3%
Source: @AstroKatie/Planck13.
Page 4: Cosmology
Definition: The study of the origin and change of the universe.
Visual representation of the universe's expansion credited to NASA.
Page 5: Theories of Origin
Key Theories:
Steady-State Model: Universe is pre-existing; new matter is created continuously.
Oscillating-Cyclic Model: Universe expands and contracts.
Big Bang Model: Universe began with a singularity explosion.
Page 6: Big-Bang Theory
Description: The universe began 13.8 billion years ago with the explosion of a point (singularity), releasing massive energy and matter.
Page 7: Cosmic Microwave Background (CMB)
Definition: Fossil radiation emitted approximately 380,000 years post-Big Bang; the oldest electromagnetic image of the Universe.
Technologies Used:
COBE (1992): Analyzed temperature fluctuations.
WMAP (2003): Measured radiation.
Planck Satellite (2013): Measured temperature and polarization.
Page 8: Universe Expansion
Hubble's Law: The universe is expanding; evidence includes galaxies moving away from each other (redshift).
Page 9: Galaxies
Definition: Collection of 200 to 400 billion stars held together by gravity.
View from Earth of different galaxy types.
Page 10: Cassiopeia
Measurement: 1 light year = 9.5 × 10^12 km; distance measurements in light-years: 800, 600, 400.
Page 11: Star Birth
Nebulae: Stars and planets are born from vast clouds of interstellar gas (H2) and dust, swirling and contracting due to gravity.
Page 12: Solar System Formation
Process Overview:
Solar Nebula Formation: A giant cloud collapsed, forming a spinning disk (4.6 billion years ago).
Protostar Formation: Center of the disk formed a protostar; the disk flattened.
Planetesimal Formation: Solid particles collided to form planetesimals.
Formation of the Sun: The protostar became the Sun via nuclear fusion.
Planet Formation: Protoplanets formed through material accumulation (4.5 billion years ago).
Formation of Moons and Objects: Moons, asteroids, and comets formed through collisions or gravitational capture.
Page 13: Planet Size Comparison
Descending Order: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury.
Page 14: Celestial Bodies
Comets: Composed of ice, rock, and dust; characterized by a luminous tail (e.g., Halley's Comet).
Asteroids: Mineral-saturated rocks located between Jupiter and Mars.
Meteoroids: Rocks smaller than asteroids.
Meteors: Meteoroids that penetrate atmosphere, burning up (shooting stars).
Meteorites: Oversized meteoroids that create craters on the ground.
Page 15: Empty Page
Page 16: Life on Earth
Timeline: Life emerged on Earth roughly 3.8 billion years ago.
Page 17: The Biosphere
Definition: The region of Earth where life can exist, combining lithosphere, atmosphere, and hydrosphere.
Function: Surface interactions sustain life, integrating soil, water, and air.
Page 18: Importance of Photosynthesis
Photosynthesis: Main energy source for the biosphere.
Interconnectedness: All spheres affect each other; balance between photosynthesis and respiration regulates atmospheric CO2.
Page 19: Human Impact on the Biosphere
Role: Humans are essential for energy balance within the biosphere.
Negative Activities: Deforestation and burning fossil fuels worsen CO2 levels and reduce atmospheric oxygen.
Page 20: Factors Affecting the Biosphere
Requirements: Optimal conditions include climate, atmosphere, humidity, temperature, and light.
Human Activity: Sustainability is crucial for maintaining the biosphere.
Influences: Biodiversity, solar activity, and universal factors also affect life.
Page 21: Ecosystem Requirements
Ecosystem Goals: Continuous recycling, meeting current needs without compromising future generations.
Page 22: Biodiversity Significance
Definition: Measures variety and number of species; ensures ecosystem stability.
Page 23: The Sun
Age: 4.5 billion years.
Composition: 92% hydrogen, 7% helium, 1% other gases.
Size: 340,000 times the size of Earth.
Distance: 150 million km (1 AU) from Earth; 26,000 light years from the galactic center.
Satellite: SOHO (launched in 1995).
Page 24: Biosphere and Energy
Energy Production: The Sun sustains life on Earth through nuclear fusion reactions.
Page 25: Nuclear Fusion Process
Equation: Hydrogen + Hydrogen → Energy + Helium (producing heat and light).
Page 26: Stellar Evolution
Pathways of Low- and Medium-Mass Stars: White dwarf, red giant, nebula; branches for high-mass stars leading to neutron stars, supernova, and black holes.
Page 27: Components of Stellar Life Cycle
Stages of Sun-like Stars:
Red Giant → Planetary Nebula → White Dwarf → Black Hole.
Page 28: Hertzsprung-Russell (H-R) Diagram
Diagram Insights: Categorizes stars based on luminosity and temperature.
Each dot represents a star.
Page 29: The Sun's Destiny
Speculative end states of the Sun's life cycle discussed.
Page 30: Photosynthesis Providers
Organisms: Autotrophs (plants, algae, some bacteria, phytoplankton) convert solar energy into chemical energy (food = glucose).
Page 31: Photosynthesis Mechanism
Chlorophyll: Pigment in autotrophs that absorbs light; chemical reactions occur in chloroplasts.
Page 32: Photosynthesis Reaction
Chemical Equation:
Carbon dioxide + Water + Light → Glucose + Oxygen.
Page 33: Importance of Photosynthesis
Benefits:
Produces carbohydrates (glucose) for energy, forms base of food chains.
Adds oxygen (O2) to the atmosphere (respiration process).
Removes carbon dioxide (CO2) from the atmosphere.
Page 34: Photosynthesis in Oceans
Oceans: Cover 70% of Earth's surface, responsible for 30% of photosynthesis.
Phytoplankton: Key players in oceanic photosynthesis, contributing to 50% of atmospheric oxygen.
Page 35: Climate Change Effects
Impact: Climate change reduces phytoplankton populations.
Consequences: Increased temperatures, acidification, and nutrient deficiencies lead to decreased O2 and increased CO2 levels.
Page 36: Cellular Respiration
Respiration Process: All organisms consume oxygen and release CO2.
Cellular Location: Occurs in mitochondria of animal and plant cells.
Chemical Equation: Glucose + Oxygen → Water + Carbon Dioxide.
Page 37: Complementary Processes
Photosynthesis and Respiration Cycle: Involves mutual dependence of oxygen and glucose.
Photosynthesis → Produces glucose and oxygen.
Respiration → Produces water and carbon dioxide.
Page 38: Earth as a Closed System
Material Recycling: Earth's materials are continuously recycled through nutrient cycles; no material is lost.
Page 39: Nutrient Cycling Processes
Cycles Involved: A) Carbon assimilation in tissuesB) Cellular respirationC) PhotosynthesisD) DecompositionE) Conversion to fossil fuelsF) PollutionG) Natural events (fires & eruptions).
Page 40: Human Impacts on Climate
Activities: Burning fossil fuels results in greenhouse gas emissions that affect climate.
Page 41: Acid Rain Formation
Effects of Pollutants: Gases released precipitate as acid rain, impacting ecosystems.
Page 42: Historical CO2 Concentration Trends
Chart Findings: CO2 levels increased by 90 ppm from 1880 to 2010, highlighting rising atmospheric CO2 concentrations over time.
Page 43: Global Temperature Changes
Temperature Rise: Global temperatures increased by 0.8°C from 1850 to 2000, indicating significant warming trends.
Page 44: Importance of Nitrogen
Critical Role: Essential for protein and DNA synthesis, foundational for growth in plants and organisms.
Page 45: Nitrogen Acquisition
Plants: Absorb nitrogen from soil through nitrates; fertilizers enhance this process.
Animals: Obtain nitrogen through food chain consumption.
Page 46: Agricultural Impacts
Factors Affecting Agriculture: Includes pesticide use, fossil fuel dependency, land usage, and fertilizer application for plant growth.
Page 47: Eutrophication Process
Steps:
Fertilizer runoff into water bodies.
Algal blooms occur.
Decreased light penetration affects submerged plants.
Algae die, leading to oxygen depletion during decomposition.
Results in fish kills due to low oxygen levels.
Page 48: Biosphere Impact
Outcomes: Eutrophication creates dead zones, reducing biodiversity and disrupting aquatic ecosystems.