science

chemical reactions

water

H2O

Oxygen

Hydrogen

Water is dihydrogen oxide

Water and it's ineraction with solids, liquids, gases
organisme in various Earth Systems

Water is not wet

Periodic table

food chains

cells

Ecosystems

living things

Air flow

gravity

Geology

Study of the earth

characteristics

rocks and minerals

composition

energy hunters

formation of the solar system

core, mantle and the crust

gears

transmit rotary motion from on shaft to another

transmit rotation from the axis of one gear to the axis of another gear

spur gear

Helical gear

Bevel gear

planetary gear

worm gear

rack and pinion gears

momentum

energy

velocity

space rock

star

100 000 million stars in the Milky Way

moon

Subtopic

solar system

black holes

Astronomy

milky way

light years

planets

Enceladus

there are between 2 billion
and 2 trillion galaxies

the first galaxy was in
discovered in the 17th century

8 planets

mercury

venus

earth

mars

jupiter

venus

neptune

uranus

saturn

hubble space elescope

NASA

big bang

the big bang happened
everywhere at once

The Big Bang theory explains
where all the hydrogen and helium
in the universe came from.

it was verified accidentally