Links and Definitions

  1. Hubble's View of the Cosmos

  2. Interactive Night Sky Map

  3. James Webb Telescope

  4. iPhone Aps for Stargazing

  5. List of Brightest Stars

  6. Local Group of Galaxies

  7. Microbial Life

  8. Naked Eye Planets

  9. Neil deGrasse Tyson

  10. New Planet Could Harbor Life

  11. NGC 6872

  12. Phases of the Moon

  13. Pistol Star

  14. Seven Planets in New Solar System

  15. Sirius A and Sirius B in Canis Major

  16. Space-time

  17. Stellar Classification

  18. TR-3B Astra

  19. Universe and Intelligent Life

  20. Universe Today

  21. Ursa Major (Big Dipper)

  22. Ursa Minor (Little Dipper)

  23. Van Allen Radiation Belt

  24. VV Cephei

  25. Water Cycle

  26. What is a Star?

  27. Whirlpool Galaxy

  1. 10 Brightest Stars in Night Sky

  2. Alien World Like One of Ours

  3. Alpha Centauri

  4. Anti-gravity Propulsion System

  5. Ariane 5

  6. Bayer Designation

  7. Beginners Guide to the Night Sky

  8. Black Hole Encyclopedia

  9. Brightest Stars in Ursa Minor

  10. Bright Stars Photo Gallery

  11. Cassini Solstice Mission

  12. Close-up look at Galaxies

  13. Constellation Guide

  14. Distance from Earth to Mars

  15. Distance from Earth to Moon

  16. Drake Equation

  17. Earthsky.org

  18. Einstein's Theory of General Relativity

  19. Explore the Solar System

  20. Galileo’s Moons

  21. How does Webb Contrast with Hubble

  22. How Far are the Planets from the Sun

  23. How far is a light-year?

  24. How far is the Sun from Earth?

  25. How much space is out there?

  26. How to find Aldebaran?

  27. How to Find the Pleiades Star Cluster?

  28. Hubble Telescope

 
  1. Large Numbers

  2. Light-year

  3. Magellanic Cloud

  4. Messier 81

  5. Multiverse

  6. Neutron Stars

  7. New Horizons Pluto Mission

  8. New Views of the Universe

  9. Observable Universe

  10. Parallax

  11. Pinwheel Galaxy (M101)

  12. Pollux

  13. Proxima Centauri

  14. Rigel

  15. Runaway Greenhouse Effect 

  16. Semi-major axis

  17. Shooting Star

  18. Sky-Map.org

  19. Solar System Tour

  20. Star Names

  21. String Theory

  22. Temperature on Mars

  23. Temperature on Venus

  24. Triangulum Galaxy

  25. VY Canis Majoris  

  26. Wardenclyffe Tower

  1. 5 Most Powerful Telescopes

  2. Arcturus

  3. Andromeda Galaxy

  4. Aldeberan

  5. Antares

  6. Astronomical unit

  7. Betelgeuse

  8. Big Bang

  9. Binary Star

  10. Black Holes

  11. Brightest Stars in Ursa Minor

  12. Carbon Cycle

  13. Classical Kuiper belt object

  14. Cold Fusion

  15. Constellations

  16. Corot Satellite

  17. Dark Matter

  18. Deneb

  19. Dwarf Planet

  20. Ecosystem

  21. Escape Velocity

  22. Exoplanets

  23. Galaxies

  24. Goldilocks Planet

  25. IC 1101 Galaxy

  26. Keplerian dynamics

  27. Kuiper Belt

  28. Kuiper belt object

  29. LaGrange Points

Amazing Universe Articles

The image to the right is the Milky Way, which includes our Solar System. The outskirts of the Milky Way is a faint band of light, made up of stars. This cosmological fact was proven in 1610 when Galileo Galilei used his telescope to see that the Milky Way consisted of thousands of individual stars. In the 1920s, observations by astronomer Edwin Hubble showed that the Milky Way is just one of many galaxies. The size of the Milky Way is 100,000 - 120,000 light-years (1 light-year = 6 trillion miles) in diameter containing 200-400 billion stars. Surrounded by several smaller satellite galaxies, the Milky Way is part of the Local Group of galaxies, which forms a subcomponent of the Virgo Supercluster.

The red arrows point to our Solar System. The Earth's Solar System is made up of the Sun and its planetary system of eight planets, their moons, and other non-stellar objects. Non-stellar objects are dwarf planets, asteroids, trojans, centaurs, Kuiper belt objects, and other trans-Neptunian objects. A trans-Neptunian object is any object in the Solar System that orbits the Sun at a greater average distance than Neptune.

The fact that we have not found intelligent life in the 5% of the universe that we have been able to observe, means nothing. Traveling at the speed of light (186,000 miles per second), it would take 8 minutes, 19 seconds to travel the 93 million miles from the Earth to the Sun. We pass the gas giant planets Jupiter, Saturn, Uranus, and Neptune. After 5 hours and 31 minutes we race past Pluto and its companion Moon. So far our journey has taken us more than 3.5 billion miles to the outer limits of our Solar System. From this point we travel at the speed of light, perpendicular to our Solar System, which quickly vanishes from sight.

5 years later, we reach the nearest star to our Solar System - Alpha Centauri. We have now traveled more than 25 trillion miles and our journey has scarcely begun.

10 light-years from our Sun, the stars within our galaxy appear to converge. 100 light-years from the Sun, patterns of gas and nebulous material form the arms of the Milky Way. 1000 light-years out, the galaxies arms and disk become more defined. It is not until we have traveled at the speed of light for 100,000 years that the entire spiral shape of the Milky Way is recognizable. From that point forward, each point of light that we see is no longer an individual star, but an entire galaxy composed of billions of stars.

5 million years after beginning our journey, the Milky Way is seen as a cluster of about 30 galaxies (known as the Local Group). 50 million light-years out, we encounter the large Virgo Supercluster, containing more than 2000 galaxies, and so it goes. 

What this means is that there is no possible way for us to find intelligent life outside of our Solar System when it would take 100,000 years (not distance but Earth years, based on time) to make it to the outskirts of ONE galaxy. This would also explain why Aliens may not have landed on our one miniscule planet. If Aliens have ever, or will ever land on Earth, they would have to be a species much more advanced than we are, and would have to be inter-dimensional beings with thousand-year life spans, and/or have figured out time-travel.

 
  1. Balance in the Eco-system
  2. Chicxulub Crater
  3. Crucified Saviors
  4. God of the Gaps
  5. Gods and Religions of Ancient Times
  6. Holocene extinction
  7. How the Jesus myth was created
  8. Mormons Baptize Notorious Killers
  9. Neogene Period
  10. Quaternary Period
  1. Cumbrian Sky
  2. Galileo’s Moons
  3. Hubble Space Telescope
  4. International Space Station
  5. NASA Website
  6. Planets Around Stars
  7. Space Expedition Videos