Large planets of the Solar system
Lesson objectives: education – to deepen the students ‘ knowledge about the structure of the Solar system illustrate the difference in size of the planets (which is the reason for the division of the planets on the terrestrial planets and giant planets) and the position of the planets from the Sun (which is the reason for the division of the planets into internal and external), to give a brief description of the physical conditions on these planets, developing the ability of students to compare, to draw conclusions, to explain physical phenomena, educational – ability to work independently and in a team, to form cognitive interest in the study of astronomy.
Please pay attention to the position of the planets from the Sun, the only star in the Solar system: mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto. To compare the sizes of planets, will try to enter the scale. Do you have any suggestions?
As a result of discussions come to the conclusion: draw a circle in the square exercise book – it would be the Land and then using the second column of the table, draw all the other planets in the selected scale. So, about palataki in diameter – mercury and Mars in one cell in diameter – Venus, 11 cells in diameter – Jupiter, 9.5 squares – Saturn, 4 squares, Uranus and Neptune. Almost point will be drawn Pluto. We will analyse.
Wachapreague? After discussion, we conclude: very similar in size mercury, Venus, Earth, Mars. This earth-like planets.
Much larger Jupiter, Saturn, Uranus and Neptune. It’s giant planets. It should be noted that the largest planet in the Solar system – Jupiter. Now Pluto does not belong not to the planets of the earth type, nor to planets– giants. Astronomers suggest you take this planet to asteroids. It should be noted, if we had in our scale to draw the Sun, then we would have to draw a circle in 109 cells. That’s how many times the Sun is larger in diameter than Earth!
Comparing the number of satellites, the average density of the planets give a General characterization of these groups of planets. After discussion, we come to the conclusion. The terrestrial planets are small in size and weight, have a high average density, they have a solid surface and are composed of heavy chemical elements, have no atmosphere, except mercury, have a small amount of natural satellites, slow compared to giant planets spinning around its own axis.
Giant planets have significant dimensions, low average density (composed of gases and therefore have no solid surface), quick rotation around its own axis, extended atmospheres, lots of moons. The giant planets are surrounded by rings consisting of small solid particles.
Now let’s analyze the position of the planets. We introduce the scale. What would you suggest? Let 1 and.e. will be equal to 1 cm or 2 tetrad cells and begin to note on the table from the left edge of the notebook the position of the planets. At 4 mm from the Sun have mercury, 7 mm from the Sun – Venus 1 cm – soil, etc. All the planets, the trajectory of which is inside the earth, called inside, outside – outside. We conclude, what planet are internal and which are external?
To the inner – mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune.
Now let’s see how are the planets of the Solar system (presentation to class) and perform the test to consolidate the material.