On Monday, February 26, our Periscope Trivia Contest was about movement in space. Here are the questions. Below are the answers and winners. How many questions can you answer correctly?
During retrograde motion, where will a planet rise?
Earth’s speed changes as it orbits the Sun. Which of Kepler’s Laws describes this change?
Galileo’s observation of the phases of what planet convinced him that the Earth orbits the Sun?
What do we need since the Earth does not go once around the Sun in exactly 365 days?
The Moon orbits the Earth once every 27,3 days. How long does the Moon take to rotate once time on its axis?
On a given day, one is likely to see the most meteors after what
Which part of the Sun experiences the longest sidereal rotation?
How many years does it take for our Solar System to orbit the Milky Way Galaxy one time?
Hubble Law, the relationship between the distance of a galaxy and redshift, is currently estimated to be about how many km/sec/Kpc?
What do we call the concentration of matter in the direction of the constellations Hydra and Centaurus, that may be pulling surrounding galaxies toward it?
Observing from the surface of the Earth, planets always rise in the East.
When Earth is closer to the Sun (November thru March) we move faster than when we are more distant (June thru August)
Galileo’s telescope made it possible for him to be the first to see the phases of Venus.
We add a leap day every four years, but we skip Leap Years in years evenly divisible by 400.
Because the orbital period is 27.3 days, as is the rotational period, we see only one side of the Moon.
There’s a small amount of wobble, letting us see maybe 10% more surface area, but this near side is what we get to admire.
We see at least a little of the dark side of the Moon anytime it;s not full. If you are standing on the Moon and the Earth is in your sky, the Earth will continue to hang in that same spot, day after day, month after month, year after year,
From Midnight to 6 am is the best time. Like looking at the front windshield of a car driving thru rain. Also, we must be before 6 am because the bright sky tends to hide the shooting stars.
The solar equator region takes about 25 days to rotate once, the mid latitudes take about 27-28 days, the poles take 33.5 days
240 million years……….CAPTAIN-DELTRON
And we are only about half way from the core to the edge of the disk.
So 75 new kilometers of space are appearing each second per megaparsec. The Andromeda Galaxy is about one Mpc from us.
The Great Attractor…………..CAPTAIN-DELTRON 5 X 1016 Solar Masses, about 150 million Light Years away
Winners Get Eternal Glory
Name…………… number of correct answers
Leaders: make a contribution in the next 30 days to one of my charities listed, and I will match it, up to $100. Tell the charity to contact me about your contribution.