in which sequence are items listed from least

In which sequence are items listed from least

total mass to greatest total mass?

(1) solar system, Milky Way, universe(2) Milky Way, solar system, universe(3) universe, Milky Way, solar system(4) Milky Way, universe, solar system

S LARSYSTEM

We revolve around (orbit) the sun.We know this because things in space look

differently at different times of the year, like...Seasons Constellations

The diagram here represents the

constellation Lyra.

Which statement best explains why Lyra is visible to an observer in New

York State at midnight in July but not visible at midnight in December?

(1) Earth spins on its axis.(2) Earth orbits the Sun.(3) Lyra spins on its axis.(4) Lyra orbits Earth.

When did the Solar system form?

4600 million years = 4,600,000,000 years = 4.6 x 106

years

Orbits result from motion of early solar system.

Terrestrial (inner) planets

Jovian (outer) planets

Asteroid belt

All planets orbit the sun

(and rotate) in the same direction.

In fact, moons orbit the

planets in the same

direction! Closer ones always orbit

faster.WHY?

Gravity is stronger when objects are closer.

More gravity

Less gravity

Which planet has a shorter

period of REVOLUTION,

the Earth or Mars?

How many times has Jupiter orbited the sun during YOUR lifetime?

the Earth

Notice any relationships?

If the average distance between Earth and theSun were doubled, what changes would occur inthe Sun’s gravitational pull on Earth and Earth’s

period of revolution?

(1) Gravitational pull would decrease and period of revolution would increase.(2) Gravitational pull would decrease and period of revolution would decrease.(3) Gravitational pull would increase and period of revolution would increase.(4) Gravitational pull would increase and period of revolution would decrease.

So, what about poor

Pluto…