Transcript pic review quest2

Did You Know?
• The The size of Pluto is smaller than the size of
the USA? Downgraded in 2006.
Now you do!
• About 50 tonnes of space dust and rocks fall to
Earth each day. In most cases, the pieces of
rocks from space fall towards the Earth and
most of these are destroyed on entry, leaving
only a fine dust behind.
• In space, astronauts cannot cry, b/c there is no
gravity, the tears can’t flow.
• If you shouted in space, someone right next to
you couldn’t hear you b/c there is no air to carry
your message.
Our star and its planets are a tiny part of the Milky Way galaxy. The Milky
Way is a huge city of stars, so big that even at the speed of light, it would take
100,000 years to cross it. All the stars in the night sky, including our sun, are
just some of the residents of this galaxy. Beyond our own galaxy lies a vast
expanse of galaxies.
Random Facts
• There are at least 100,000,000,000 galaxies in the
universe. A galaxy is full of stars: Our sun is just one
of at least 100,000,000,000 stars in our own Milky
Way galaxy, and each of those stars could have their
own planetary system.
• The Milky Way galaxy is in the Local Group, a
neighborhood of about 30 galaxies. Our nearest
major neighboring galaxy is called Andromeda.
• More than 1,700 extrasolar planets (or exoplanets)
planets have been confirmed. There are thousands of
potential exoplanets awaiting discovery confirmation.
Black holes are not empty spaces in the Universe. A black
hole is a great amount of matter packed into a very small
area, which results in a gravitational field so strong that
nothing -- not even light -- can escape.
More Fun Facts…
• About 99.86% of the mass of the Solar System
is made of the sun!
• The moon is drifting from Earth at a speed of
5cm per year.
• A full moon is 9 times brighter than a half
moon.
• The light from the sun takes 8min to reach the
Earth.
• Neptune was the first planet found by
mathematical predictions.
• Now let’s test what you know one last time!