Movement in Space Part I
A giant ball of superheated gas, or plasma, composed of hydrogen and helium.
star
This model puts the sun in the center of the universe.
Heliocentric model?
Why does the moon appear to change shape?
The moon rotates and revolves. Because the moon orbits earth the surface that is visible changes.
What is the structure of the sun?
The interior layer of the Sun includes the core, radiative zone, and convective zone. The photosphere is the surface layer of the Sun, and the solar atmosphere includes the chromosphere and corona.
What is the apprent brightness of a star?
The apparent brightness is how much energy/light is coming from the star per square meter per second, as measured on Earth.
A cold mixture of dust and ice that develops a long trail of light as it approaches the sun.
Comet.
A celestial body orbiting the earth or another planet
A Satellite.
How do the sun and moon affect tides?
When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides
The big Bang.
What happens when a star dies?
When the helium fuel runs out, the core will expand and cool. The upper layers will expand and eject material that will collect around the dying star to form a planetary nebula. Finally, the core will cool into a white dwarf and then eventually into a black dwarf.
1. Small rock in space smaller than an asteroid
2. Small rock in the earth's atmosphere illuminated by the heat burning the rock up in the atmosphere
3. Small rock that has hit earths surface
1. meteoroid
2. meteor
3. Meteorite
This person created a telescope which helped him discover moons orbiting Jupiter.
Galileo Galilei?
What causes solar and lunar eclipses?
A solar eclipse happens when the Moon passes between the Sun and Earth, casting a shadow on Earth that either fully or partially blocks the Sun's light in some areas. During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon.
How do scientists use technology to learn about the universe?
Scientists use telescopes, both optical and radio, as well as space probes to collect data.
what is a lightyear?
A unit of astronomical distance equivalent to the distance that light travels in one year.
Why can we not see the same constellations at all times of the year?
The objects visible in the sky depends on the movement of earth. The constellations visible change from season to season based on the position of earth on its journey around the sun.
An object that orbits the sun, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit of any debris.
planet
Explain the moon phases.
The four major phases are the new moon, the first quarter, the full moon and the last quarter; the four minor phases are waxing crescent, waxing gibbous, waning gibbous, and waning crescent. When waxing the moon is growing. When waning the moon is shrinking in appearance.
How does the electromagnetic spectrum help scientists learn about the universe in ways our eyes cannot?
All objects in space give off energy in the form of waves. Scientists use technology to detect these waves and produce images that we can see. Usually we can only see visible light, but technology can detect waves such as microwaves, x rays, and gamma rays that we cannot see with our eyes.
What does the color of a star tell you?
A star's color provides a direct measurement of its surface temperature; the hottest stars shine blue-white, while the coolest are dull orange or red.
Many of the early observers of the universe’s theory was that earth was at the center and all of the celestial bodies revolved around it. What is this model called?
The Geocentric Model.
What two forces keep the moon in orbit around earth?
Gravity and inertia.
Explain why we only see 1 side of the moon.
The time taken for the Moon to spin on its axis is almost exactly the same as the time it takes to orbit the Earth. Hence, the Moon always keeps the same side pointing our way.
This 1969 space mission involving Neil armstrong acomplished what?
Man landing on the moon.
Explain what determines the lifespan of a star?
Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion. A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for about 10 billion years.