The Size Of Our World. Resizenowmap.jpg (JPEG Image, 715×514 pixels) Build a Solar System Model. Free Astronomy Books. Errors in the "The Big Bang Never Happened" Top | Criticism | Alternative | Miscellaneous | Bottom Eric Lerner starts his book "The Big Bang Never Happened" (hereafter BBNH) with the "errors" that he thinks invalidate the Big Bang.
These are Are these criticisms correct? No, and they were known to be incorrect in 1991 when Lerner wrote his book. Let us look at the superclusters first. Lerner gives the example of filaments or sheets 150 million light years apart in Figure 1.1, and then asserts that material would have to travel 270 million light years to make the structure. Furthermore, velocities relative to the Hubble flow naturally decrease with time, so the 1000 km/sec velocity was larger in the past. For example, the neutrinos in the hot dark matter model are just coasting, or "free streaming". V = H*D*Omega0.6 Using Lerner's value of 1000 km/sec, and a distance of 75 million light years, and Ho = 50 km/sec/Mpc, we find perfect agreement as long as Omega is close to 1.
Our place in the cosmos. Universcale. ASTR 1230, Whittle [Fall 2009]. Lecture Notes. What Happened Before the Big Bang? The New Philosophy of Cosmology - Ross Andersen - Technology. What existed before the big bang?
What is the nature of time? Is our universe one of many? On the big questions science cannot (yet?) Answer, a new crop of philosophers are trying to provide answers. Last May, Stephen Hawking gave a talk at Google's Zeitgeist Conference in which he declared philosophy to be dead. In December, a group of professors from America's top philosophy departments, including Rutgers,* Columbia, Yale, and NYU, set out to establish the philosophy of cosmology as a new field of study within the philosophy of physics. Cdfs_ill_ionlabel.jpg (JPEG Image, 1800×792 pixels) - Scaled (79%) How Big Are Solar Flares? Pie.jpg (JPEG Image, 612×792 pixels) - Scaled (82%)
Earth-class Planets Line Up. In this space wallpaper, this chart compares the first Earth-size planets found around a sun-like star to planets in our own solar system, Earth and Venus.
NASA's Kepler mission discovered the new found planets, called Kepler-20e and Kepler-20f. Kepler-20e is slightly smaller than Venus with a radius .87 times that of Earth. Kepler-20f is a bit larger than Earth at 1.03 times the radius of Earth. Venus is very similar in size to Earth, with a radius of .95 times that our planet. Prior to this discovery, the smallest known planet orbiting a sun-like star was Kepler-10b with a radius of 1.42 that of Earth, which translates to 2.9 times the volume. Both Kepler-20e and Kepler-20f circle in close to their star, called Kepler-20, with orbital periods of 6.1 and 19.6 days, respectively. There are three other larger, likely gaseous planets also know to circle the same star, known as Kepler-20b, Kepler-20c and Kepler-20d. Credit: NASA/Ames/Caltech. We are listening. NRAO Very Large Array. The Nine Planets Solar System Tour.
Lunar Eclipses for Beginners. 2004 Lunar Eclipse SequenceThe total lunar eclipse of 2004 Oct 28 was widely visible from the USA.This sequence of images captures the eclipse from start (right) to finish (left).
(click to see more images) (c) Copyright 2007 by Fred Espenak Introduction. HST. Video. Video. Physics 20b: Introduction to Cosmology - Spring 2010 - Download free content from UC Irvine. Mysteries of Deep Space - History of the Universe Timeline. Radio telescopes capture best-ever snapshot of black hole jets.
An international team, including NASA-funded researchers, using radio telescopes located throughout the Southern Hemisphere has produced the most detailed image of particle jets erupting from a supermassive black hole in a nearby galaxy.
Universe-history-wmap.jpg (JPEG Image, 496×358 pixels) Radio_broadcasts.jpg (JPEG Image, 2795×2795 pixels) The Carl Sagan Portal. Space Adventures. Powers of Ten. Based on the film by Charles and Ray Eames. An Eames Office Website. NASA Science. The Scale of the Universe. Your Age on Other Worlds. Explore Nature» Air Resources Division-Natural Lightscapes. The darker the sky, the more stars can be seen.
The following simulated images depict how the constellation Orion appears under various sky conditions. Images are courtesy of GLOBE at Night. How good is your sky at home? Limiting Magnitude=2. This is typical of an urban sky. Ensign Software - ESPL: Dances of the Planets. The planets in the heavens move in exquisite orbital patterns, dancing to the Music of the Cosmos.
There is more mathematical and geometric harmony than we realize. The idea for this article is from a book Larry Pesavento shared with me. The book, 'A Little Book of Coincidence' by John Martineau, illustrates the orbital patterns and several of their geometrical relationships. . PH1600- Introductory Astronomy - Download free content from Michigan Technological University. New estimate for alien Earths: 2 billion in our galaxy alone. Roughly one out of every 37 to one out of every 70 sunlike stars in the sky might harbor an alien Earth, a new study reveals.
These findings hint that billions of Earthlike planets might exist in our galaxy, researchers added. These new calculations are based in data from the Kepler space telescope, which in February wowed the globe by revealing more than 1,200 possible alien worlds, including 68 potentially Earth-size planets. The spacecraft does so by looking for the dimming that occurs when a world transits or moves in front of a star.
Scientists at NASA's Jet Propulsion Laboratory in Pasadena, Calif., focused on roughly Earth-size planets within the habitable zones of their stars — that is, orbits where liquid water can exist on the surfaces of those worlds. [The Strangest Alien Planets] "This means there are a lot of Earth analogs out there — two billion in the Milky Way galaxy," researcher Joseph Catanzarite, an astronomer at NASA's Jet Propulsion Laboratory, told SPACE.com. First man in space. Daylight Hours Explorer.
Shows the hours of daylight received during the year for an observer at a given latitude.
This is an important factor contributing to the seasons. Running this animation on your computer... Carl Sagan will now remind you what we get by going to space. What Are The Odds? Gravity Probe B - Special & General Relativity Questions and Answers. Distances from the Sun.
LIVE REAL TIME SATELLITE AND SPACE SHUTTLE TRACKING AND PREDICTIONS. Video Courses on Academic Earth. Astronomers use tools like telescopes, cameras and spectrographs to study interactions between materials and energy within the universe.
These scientists learn about galaxies, solar systems, planets and stars through careful observation and measurement recording. Astronomers also refer to natural sciences and mathematics to form and test theories. Brian Greene on string theory. Patricia Burchat sheds light on dark matter.