Celestial Equator
... The ancient Greeks introduced ingenious, but complicated ideas, to describe planetary motions about the Earth in a manner in keeping with the geocentric model. Their final model was that of Ptolemy (2nd century), which held sway until the Copernican revolution of the 16th century. The Earth lies at ...
... The ancient Greeks introduced ingenious, but complicated ideas, to describe planetary motions about the Earth in a manner in keeping with the geocentric model. Their final model was that of Ptolemy (2nd century), which held sway until the Copernican revolution of the 16th century. The Earth lies at ...
KS3 Physics – The Solar System
... KS3 Physics – The Solar System – Learning Objectives NB. Some areas of this topic may be omitted due to time constraints. ...
... KS3 Physics – The Solar System – Learning Objectives NB. Some areas of this topic may be omitted due to time constraints. ...
Lecture 2
... The Greeks knew that the lack of observable parallax could mean one of two things: 1. Stars are so far away that stellar parallax is too small to notice with the naked eye 2. Earth does not orbit Sun; it is the center of the universe With rare exceptions such as Aristarchus, the Greeks rejected the ...
... The Greeks knew that the lack of observable parallax could mean one of two things: 1. Stars are so far away that stellar parallax is too small to notice with the naked eye 2. Earth does not orbit Sun; it is the center of the universe With rare exceptions such as Aristarchus, the Greeks rejected the ...
Scientific American`s Ask the Experts
... steeply with decreasing size, but even at micrometer sizes the Pioneer spacecraft were hit only a few times during their passage. That is not to say that asteroids cannot pose any danger, however. It is worth noting that for a large planet like Earth, over a long period of time, there is an apprecia ...
... steeply with decreasing size, but even at micrometer sizes the Pioneer spacecraft were hit only a few times during their passage. That is not to say that asteroids cannot pose any danger, however. It is worth noting that for a large planet like Earth, over a long period of time, there is an apprecia ...
Prominences in H alpha and He II Spectrum of the Sun
... but typically possess temperature hundreds of times lower and densities hundreds to thousands of times higher than the corona. They are created for about a day but can last for weeks and even months. During this time they constantly change its length, thickness and shape. Prominences may reach hundr ...
... but typically possess temperature hundreds of times lower and densities hundreds to thousands of times higher than the corona. They are created for about a day but can last for weeks and even months. During this time they constantly change its length, thickness and shape. Prominences may reach hundr ...
Document
... Make a note of where the sun is when you’re outside on break. When it’s cloudy, can you still guess where the sun might be? Draw a map of where you are and put an arrow showing which way is South. REMEMBER: NEVER LOOK STRAIGHT AT THE SUN! ...
... Make a note of where the sun is when you’re outside on break. When it’s cloudy, can you still guess where the sun might be? Draw a map of where you are and put an arrow showing which way is South. REMEMBER: NEVER LOOK STRAIGHT AT THE SUN! ...
Lesson Overviews and Content Standards
... compare and contrast images of different stellar nurseries imaged by the Hubble Space Telescope. Key concepts include: • Stars are different ages. • Stars are born in giant clouds of gas and dust. • Many more low mass (cool) stars are born than high mass (hot) stars. Lifetimes of Stars: In this acti ...
... compare and contrast images of different stellar nurseries imaged by the Hubble Space Telescope. Key concepts include: • Stars are different ages. • Stars are born in giant clouds of gas and dust. • Many more low mass (cool) stars are born than high mass (hot) stars. Lifetimes of Stars: In this acti ...
Nucleus hydrogen helium Relative Mass 1.007825 4.0037 Helium
... star may eventually form a black hole. To gain full marks in this question you should write your ideas in good English. Put them into a sensible order and use the correct scientific words. ...
... star may eventually form a black hole. To gain full marks in this question you should write your ideas in good English. Put them into a sensible order and use the correct scientific words. ...
Document
... Almost all stars we see are in one of these groups, but they don’t stay in the same place. ...
... Almost all stars we see are in one of these groups, but they don’t stay in the same place. ...
notes
... water on Earth if… • We moved it to an O-type star (T = 30,000 K) and placed it at the same distance that it currently is from our Sun (T = 5800 K) • We moved it to an M-type star (T = 3000 K) and placed it at the same distance that it currently is from our Sun • In each of these cases, where should ...
... water on Earth if… • We moved it to an O-type star (T = 30,000 K) and placed it at the same distance that it currently is from our Sun (T = 5800 K) • We moved it to an M-type star (T = 3000 K) and placed it at the same distance that it currently is from our Sun • In each of these cases, where should ...
Slide 1
... Saturn is also known Cronus; he is one of Titans to overthrow father sky or Uranus with a scythe and throwing his body parts into the sea, which created Venus, Furies, and some giants and nymphs. Cronus and Rhea (Cronusís sister) had six children. Cronus was afraid that his own children would overth ...
... Saturn is also known Cronus; he is one of Titans to overthrow father sky or Uranus with a scythe and throwing his body parts into the sea, which created Venus, Furies, and some giants and nymphs. Cronus and Rhea (Cronusís sister) had six children. Cronus was afraid that his own children would overth ...
PHYS-633: Problem set #2
... burning H in the shell around the hot He core. How long (in Myr) can it last in this stage before it doubles the amount given in part c for H consumed by core burning during the full main sequence. 4. Planetary nebula emission and expansion Suppose we observe the Hα line from a spherical planetary n ...
... burning H in the shell around the hot He core. How long (in Myr) can it last in this stage before it doubles the amount given in part c for H consumed by core burning during the full main sequence. 4. Planetary nebula emission and expansion Suppose we observe the Hα line from a spherical planetary n ...
Lesson Plan on Kepler`s Laws of Planetary Motion
... 8. Halley’s comet has a semimajor axis of about 18.5 AU, a period of 76 years, and an eccentricity of about 0.97. The orbit of Halley’s Comet, the Earth’s Orbit, and the Sun are shown in the diagram below (not exactly to scale). Based upon what you know about Kepler’s 2 nd Law, explain why we can on ...
... 8. Halley’s comet has a semimajor axis of about 18.5 AU, a period of 76 years, and an eccentricity of about 0.97. The orbit of Halley’s Comet, the Earth’s Orbit, and the Sun are shown in the diagram below (not exactly to scale). Based upon what you know about Kepler’s 2 nd Law, explain why we can on ...
What Makes a Planet Habitable?
... mentioned before already; this magnetic wind carries away angular momentum from the star and so lets it spin down. The star’s progressively slower rotation weakens the internal dynamo in turn, producing less magnetic activity, and so the ultraviolet and X-ray emissions decline with time in a rather ...
... mentioned before already; this magnetic wind carries away angular momentum from the star and so lets it spin down. The star’s progressively slower rotation weakens the internal dynamo in turn, producing less magnetic activity, and so the ultraviolet and X-ray emissions decline with time in a rather ...
Activity 3 Orbits and Effects
... Earth’s orbit changes over time, because of complicated effects having to do with the weak gravitational pull of other planets in the solar system. Over the course of about 100,000 years, the Earth’s orbit ranges from nearly circular (very close to zero eccentricity) to more elliptical (with an ecce ...
... Earth’s orbit changes over time, because of complicated effects having to do with the weak gravitational pull of other planets in the solar system. Over the course of about 100,000 years, the Earth’s orbit ranges from nearly circular (very close to zero eccentricity) to more elliptical (with an ecce ...
Voyager Program
... The spacecraft are continuing to return data about interplanetary space and some of our stellar neighbours near the edges of the Milky Way. As the Voyagers cruise gracefully in the solar wind, their fields, particles and waves instruments are studying the space around them. In May 1993, scientists c ...
... The spacecraft are continuing to return data about interplanetary space and some of our stellar neighbours near the edges of the Milky Way. As the Voyagers cruise gracefully in the solar wind, their fields, particles and waves instruments are studying the space around them. In May 1993, scientists c ...
Corresponding Angles and Distances forvJarded expressly for
... orbit; but the stars, which have latterly been gradually approaching, have within the last two years closed up so rapidly as to be in the early part of the current year quite beyond the power of my instrument, the distance being estimated as not exceeding o"· 4, while only a rough guess could be mad ...
... orbit; but the stars, which have latterly been gradually approaching, have within the last two years closed up so rapidly as to be in the early part of the current year quite beyond the power of my instrument, the distance being estimated as not exceeding o"· 4, while only a rough guess could be mad ...
Great Galaxies 5 - School Performance Tours
... is often brighter in the morning and can be seen from our planet _____________. The second planet from the sun is called Venus. It was named after a _____________ Goddess. Venus is sometimes called Earth's _____________ because it is similar in size. The third planet from the sun is ___________ . It ...
... is often brighter in the morning and can be seen from our planet _____________. The second planet from the sun is called Venus. It was named after a _____________ Goddess. Venus is sometimes called Earth's _____________ because it is similar in size. The third planet from the sun is ___________ . It ...
Starlight and What it Tells Us
... The Heavens Are Not Changeless • The Stars Move – Most of our constellations would have been unrecognizable to Neanderthal Man ...
... The Heavens Are Not Changeless • The Stars Move – Most of our constellations would have been unrecognizable to Neanderthal Man ...
Formation and evolution of the Solar System
The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.