Space Physics

Planets, etc

How many planets are there in our ecosystem?

8

First planet from the sun

Mercury 

Second planet from the sun

Venus

Third planet from the sun

Earth

Fourth planet from the sun

Mars

Fifth planet from the sun

Jupiter

Sixth planet from the sun

Saturn

Seventh planet from the sun

Uranus

Eight planet from the sun

Neptune

What is the speed of light?

3 × 10^8 m/s

Formula to calculate the time taken to travel between astronomical objects.

Time = Distance / Speed

Orbital speed formula

v = 2πr/T

Planets further from sun results in ______ orbital speeds because of _______ field strength _____.

Slower, gravitational field, weakening.

Life cycle of a star

Nebula to protostar

3 possible outcomes after protostar

Small mas star, large mass star, and very large star.

How does a small mass star occur?

Red giant to white dwarf + planetary nebula

How does a large mass star occur?

Red supergiant to supernova to neutron star?

How does a very large mass star occur?

Red supergiant to supernova to black hole.

How large is the sun?

The suns diameter is around 100,000 light years.

What is the universe expanded from?

A single point of high density and temperature.

How old is the universe?

13.8 billion years old.