Solar System Mixed Practice
| # | Answer |
|---|---|
| 1 | The Solar System is the collection of the Sun and all objects gravitationally bound to it, including planets, dwarf planets, moons, asteroids, comets, and dust. |
| 2 | The Sun. |
| 3 | Mercury, Venus, Earth, Mars. |
| 4 | Planet. |
| 5 | Gravity. |
| 6 | Mercury. |
| 7 | A star produces energy through nuclear fusion, while a planet does not and instead orbits a star. |
| 8 | Jupiter. |
| 9 | A moon is a natural satellite that orbits a planet or other smaller body. |
| 10 | Orbit. |
| 11 | Saturn. |
| 12 | Ellipses. |
| 13 | Mars. |
| 14 | The asteroid belt. |
| 15 | Rotation is the spinning of a body on its axis. |
| 16 | Revolution is the movement of a body around another body in orbit. |
| 17 | Because Earth rotates on its axis, causing different parts of the planet to face the Sun at different times. |
| 18 | Mercury. |
| 19 | The Kuiper Belt. |
| 20 | A dwarf planet orbits the Sun and is nearly round, but has not cleared its orbital neighborhood. |
| 21 | Any two of: Pluto, Eris, Haumea, Makemake, Ceres. |
| 22 | They reflect sunlight. |
| 23 | Hydrogen and helium. |
| 24 | Nuclear fusion is the process in which hydrogen nuclei combine to form helium, releasing large amounts of energy. |
| 25 | It holds planets, comets, asteroids, and other objects in orbit around it. |
| 26 | Because the inner Solar System was hotter, so only metals and silicates condensed there, while beyond the frost line volatile compounds could form solid bodies that later accumulated more gas and ice. |
| 27 | The distance from the Sun beyond which temperatures are low enough for volatile compounds such as water, ammonia, and methane to condense into ice. |
| 28 | Venus has a very dense carbon dioxide atmosphere that creates a strong greenhouse effect, trapping heat more effectively than Mercury’s almost nonexistent atmosphere. |
| 29 | The warming of a planet’s surface and lower atmosphere caused by atmospheric gases trapping outgoing infrared radiation. |
| 30 | Comets are made largely of ice, dust, and rocky material, while asteroids are mainly rocky or metallic. |
| 31 | Its ices vaporize, creating a coma and often one or more tails driven by solar radiation and the solar wind. |
| 32 | Because radiation pressure and the solar wind push gas and dust away from the Sun. |
| 33 | Earth has liquid water, a suitable temperature range, and a protective atmosphere with conditions that allow life to persist. |
| 34 | It absorbs harmful ultraviolet radiation, helps regulate temperature, and burns up many small meteoroids before they reach the surface. |
| 35 | A meteoroid is a small object in space, a meteor is the streak of light produced when it enters the atmosphere, and a meteorite is the part that reaches the ground. |
| 36 | Because the Moon rotates once in the same amount of time that it revolves around Earth, a state called synchronous rotation. |
| 37 | The Moon’s gravity, and to a lesser extent the Sun’s gravity, creates differences in gravitational pull across Earth, causing ocean water to bulge and producing tides. |
| 38 | It helps identify the environmental conditions needed for habitability, the distribution of water and organic molecules, and how planetary environments influence the emergence and persistence of life. |
| 39 | It is the region around a star where temperatures may allow liquid water to exist on a planet’s surface, increasing the potential for life as we know it. |
| 40 | It suggests very low current habitability because the planet lacks stable surface water and environmental conditions likely necessary to support life as known on Earth. |