Planets
What is the largest planet in our solar system?
Jupiter
What color is our star?
yellow
The Hertzsprung-Russel Diagram (HR diagram) classifies stars by what two variables?
surface temperature and brightness
What is the name of our galaxy?
The Milky Way
What is a light-year?
the distance light travels in one year (9.5 trillion km or 6 trillion miles)
What are the four inner (rocky) planets?
Mercury, Venus, Earth and Mars
Our star is considered a: dwarf, medium, large or supergiant star?
medium
What does luminosity mean?
the measure of how bright something is
Our galaxy is considered what type of galaxy: elliptical, spiral, spherical or a dwarf galaxy?
spiral galaxy
What does an astronomical unit (AU) measure?
the distance between the Earth and the sun (93 million miles)
What are the four gas giant planets?
Jupiter, Saturn, Uranus, Neptune
What color star has the hottest surface temperature?
blue
How many stars are there in a binary star system?
two
How many stars do galaxies typically hold: hundreds, thousands, millions or billions?
billions
How far away is the nearest star (Proxima Centauri) to us on Earth?
4.25 miles, 4.25 million miles, 4.25 AU, 4.25 ly
4.25 ly
Earth is the ___ planet from the sun.
(1st, 2nd, 3rd, 4th...etc.)
3rd
Why does our star seem to be the brightest object in space to us on Earth?
It is the closest star to us
Would a galaxy that is 110 ly across have more or less stars in it compared to a galaxy that is 1000 ly across?
less
What unit do we measure the distance between galaxies and stars?
light-years
Why don't we just use miles or km when referring to the distance between objects in space?
because the numbers would be too large
Which planet is the smallest in our solar system?
Mercury
A nebula, stars and the outer planets are all made up of what type of matter?
gases
Why do scientists perform the same experiment as other scientists, called replication?
it proves that the experiment is more likely to be correct and/or accurate
How many galaxies are there in our observable universe: hundreds, thousands, millions or billions?
billions
Put these four words in order from smallest to largest:
universe, planet, star system, galaxy
planet, star system, galaxy, universe