Level 4 Level 6
Level 5


8 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Atacama desert
the driest desert in the world
very large telescope
submillimeter radiation
electromagnetic waves with a wavelength less than one millimeter
21 July 1969
The date of the first human on the moon during the Apollo 11 mission. His name was Neil Armstrong.
air shower
a cleansing process which during jets of air blow tiny pieces of lint and dust of the clothing of employees who work in clean rooms
cosmic rays
are very high energy particles, mainly originating in outer space, outside the Solar system
it is an electrically neutral subatomic particle
cryogenically cooled
cooled to a very low temperature