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sciencem
questions
| Question | Answer |
|---|---|
| where is most of earth's water found | the ocean |
| what makes a rocket move forward | gases shooting out the back of the rocket push it in the opposite directions |
| what is net force | the combination of all forces acting on an object |
| what causes you to continue moving forward in a car if I suddenly stops | inertia |
| what determines the lifetime of a star | mass |
| what does the solar system consist of | sun,8planets, their moons, smaller objects, comets, and asteroids |
| what is earths revolution? | 365 days |
| what is so unique about Uranus | its axis of rotation is tilted at an angle about 90 degrees from the vertical |
| what is the hertzsprung-russel diagram | shows the relationship between surfaces temp. and absolute brightness of stars |
| what happens to the period of revolution of the planets the farthest they are from the sun | it takes longer to complete one trip around the sun |
| why do scientist send up unmanned space probes in space | to observe and bring info. collect data |
| where are the hottest stars found on the h-r diagram | upper left corner |
| what are main sequence stars | 90% of all stars, including the sun |
| who was Neil Armstrong | first man on the moon |
| explain newton's 3rd law of motion | inertia, an object mass, acceleration, and the forces acting on the objects are related |
| who was Yuri Gagarin | first human in space |
| how long s earth's rotation | 24 hours |
| why does earth have seasons | earths axis |
| what causes earths plates to move | convection currents |
| how does water vapor enter the atmosphere | evaporation |
| what is a black hole | an object with gravity so strong that nothing not even light can escape |
| what are planetesimals | one of the small asteroid like bodies that form the building blocks of the planets |
| what do astronauts encounter in space | low oxygen levels, decreased gravity, bright stars |
| what is a spectrograph | an instrument that separates light into colors and makes an image of the resulting spectrum |
| what is magnetic field | lines of force around a magnet |
| what is acceleration | the rate at which velocity changes |
| what keeps planets in orbit | inertia and gravity |
| what keeps the earth in motion around the sun | gravity |
| what force formed the sun, planets, and other objects from the solar system | gravity |
| what is used in space to collect weather data | satellites orbiting earth |
| how do scientist explain global warning cause | increased levels of carbon dioxide |
| what do the outer planets have in common | rings |
| what is the law or universal gravitation | states that every object in the universe attracts every other object |
| why does earth have 4 seasons | the tilt of earths axis |
| what property changes for an astronaut on the moon then on the earth | weight |
| what do all the inner planets have in common | relatively small rocky surfaces |
| what causes a solar eclipse | the moon is directly between the sun and earth |
| what causes most water pollution | human activities |
| what is inertia | the tendency of an object to resist a change in motion |
| what two main factors determine the climates of a region | the temperature and precipitations |
| what do all space probes need in order to function | a communication system to send and receive signals |
| what is visible spectrum | what happens to whit light when it through a prism by breaking up into a range of colors |
| what happens to the most low mass or medium mass stars | become white dwarfs |
| what is a nebula | were all stars begin life |
| when do lunar eclipse occur | during a full moon earth is directly between the sun and the moon |
| what causes tides | differences in how much gravity from the moon and the sun pulls on different parts of earth, moon, and sun |
| what is astronomical unit | a unit of distances equal to the average distances between earth and the sun, about 150 million kilometers 1AU |
Created by:
studystackm
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