Saturday: Lieutenant Worf, the Klingon Starfleet officer on Star Trek: The Next Generation, might say “Today is a good day to die.” But Deneb, the bright supergiant star in Cygnus the Swan, would say “two million years from now is a good day to die.” This may seem like a long time. But, compared to the lifespan of most stars, two million years from now is as close as tomorrow. For example, the Sun will last about five billion years. Small stars known as red dwarfs may last trillions of years. Prepare your astronomically short goodbyes to Deneb tonight at 6:30 o’clock when it is seven and a half fists held upright and at arm’s length above due west.
Sunday: Along with the not-so-subtle drug reference in their
name, The Doobie Brothers could have made an astronomy reference in their song
lyrics if they would have written: “Old Earth water, keep on rollin’,
Mississippi moon won’t you keep on shining on me.” Astronomers now think that
some of the water on Earth may be older than the Solar System. The chemical
signature of the water indicates it came from a very cold source, just a few
degrees above absolute zero. The early Solar System was much warmer than this,
meaning the water came from a source outside the Solar System. For more
information about the old Earth water, go to https://www.skyatnightmagazine.com/news/earth-water-formed-billions-years-ago-before-sun
Monday: Mars and Jupiter are as close together in the sky as
they’ll get this year. At midnight, they are a little less than one fist above
the eastern horizon, with Jupiter being the brightest of the two. The bright
star Regulus is between the two planets and the horizon. Over the next few
days, Mars will continue moving towards Regulus in the sky.
Tuesday: The Leonid meteor shower peaks early this morning
and tomorrow morning. There will be increased activity for the next few days.
These meteors appear to come from a point in the constellation Leo the lion.
This point is about five and a half fists above the southeastern horizon at
5:00 a.m. The Moon is near the first quarter phase so it will set before prime
viewing time. The Leonid meteors are particles from the tail of Comet
Tempel-Tuttle, a comet discovered by Ernst Tempel and Horace Parnell Tuttle in
1866. These are exceptionally fast-moving meteors – over 150,000 miles per
hour! Go to https://earthsky.org/astronomy-essentials/everything-you-need-to-know-leonid-meteor-shower/
to read everything you need to know about the Leonid meteor shower. As your mother
might say, dress warm and sit in a comfortable chair for maximum enjoyment.
Wednesday: At 6:15 a.m., Venus is one and a half fists above
the southeastern horizon. The bright star Spica is right below it. Mercury is
about one fist above the east-southeastern horizon.
Thursday: Are you thankful that you live in a solar system
with multiple planets? You should be. A giant planet like Jupiter cleans up
planetary debris that could have collided with Earth and hindered the formation
of complex life. Any inhabitants of the planets orbiting Upsilon Andromedae are
thankful for this, as well. Upsilon Andromedae, a star in the constellation
Andromeda, was the first Sun-like star discovered to have multiple planets
orbiting it. So far, all its discovered planets are giant planets like Jupiter.
But the system is likely to also contain smaller planets. The dim star, but
certainly not its planets, is barely visible overhead at 10:00 p.m.
Friday: The moon is five fists above due south at 8:30 p.m.
Saturn is half a fist below the moon at this time.
The positional information in this column about stars and
planets is typically accurate for the entire week. For up-to-date information
about the night sky, go to https://nightsky.jpl.nasa.gov/planner.cfm.
All times are Pacific Time unless noted.