|
Astronomy Picture of the Day |
APOD: 2025 January 11 - An Evening Sky Full of Planets
Explanation:
Only Mercury is missing from a
Solar System
parade of planets in this
early evening skyscape.
Rising nearly opposite the Sun, bright Mars is at the far left.
The other naked-eye planets Jupiter, Saturn, and Venus,
can also be spotted, with the
positions of too-faint Uranus and Neptune marked
near the arcing trace of the
ecliptic plane.
On the far right and
close to the western horizon after sunset is a young crescent
Moon whose surface is partly illuminated by earthshine.
In the foreground of the composite panorama captured on 2 January, planet
Earth is represented by Mount Etna's lower
Silvestri Crater.
Of course Earth's
early evening skies are
full of planets for the entire
month of January.
On 13 January,
a nearly Full Moon will appear to pass in front of Mars
for skywatchers in the continental U.S. and Eastern
Canada.
APOD: 2023 January 2 – After Sunset Planet Parade
Explanation:
Look up tonight and see a whole bunch of planets.
Just after sunset, looking west, planets
Venus,
Saturn,
Jupiter and
Mars will all be
simultaneously visible.
Listed west to east, this planetary lineup will have Venus nearest the horizon, but setting shortly after the Sun.
It doesn't matter where on
Earth you live because this early evening
planet parade will be visible
through clear skies all around the globe.
Taken late last month, the featured image captured
all of these planets and more: the
Moon and planet
Mercury were also simultaneously visible.
Below visibility were the planets
Neptune and
Uranus,
making this a nearly
all-planet panorama.
In the foreground are hills around the small village of Gökçeören,
Kaş,
Turkey, near the
Mediterranean coast.
Bright stars
Altair,
Fomalhaut, and
Aldebaran
are also prominent, as well as the
Pleiades star cluster.
Venus will
rise higher in the sky at sunset as January continues,
but Saturn will descend.
APOD: 2022 July 9 - Saturn and ISS
Explanation:
Soaring high in skies around planet Earth, bright planet
Saturn was a star of
June's morning planet parade.
But very briefly on June 24 it posed with a bright object in
low Earth orbit, the International Space Station.
On that date from a school parking lot in
Temecula, California the ringed-planet and
International Space Station
were both caught in this single
high-speed video frame.
Though Saturn was shining at +0.5 stellar magnitude
the space station was an even brighter -3
on the magnitude scale.
That difference in brightness is faithfully represented
in the video capture frame.
In the challenging image, the orbiting ISS was at a range of 602 kilometers.
Saturn was about 1.4 billion kilometers from the
school parking lot.
APOD: 2022 June 29 - Solar System Family Portrait
Explanation:
Yes, but have you ever seen all of the planets at once?
A rare roll-call of planets has
been occurring in the morning sky for
much of June.
The featured fisheye all-sky image, taken a few mornings ago near the town of
San Pedro de Atacama in
Chile,
caught not only the entire planet parade, but the Moon between Mars and Venus.
In order, left to right along the
ecliptic plane,
members of this
Solar System family portrait are
Earth,
Saturn,
Neptune,
Jupiter,
Mars,
Uranus,
Venus,
Mercury, and
Earth.
To emphasize their locations, Neptune and Uranus have been artificially enhanced.
The volcano just below Mercury is
Licancabur.
In July, Mercury will move into the Sun's glare but
reappear a few days later on the evening side.
Then, in August,
Saturn will drift past the direction
opposite the Sun
and so become visible at dusk instead of dawn.
The next time that all eight planets will be
simultaneously visible in the evening sky will be in 2122.
APOD: 2022 May 4 - Planets Over Egyptian Pyramid
Explanation:
The early morning planet parade continues.
Visible the world over, the planets Jupiter, Venus, Mars and Saturn
have been lining up in the pre-dawn sky since mid-April.
In the
featured image
taken last month, these planets were captured over the Step
Pyramid of Djoser,
a
UNESCO World Heritage
Site.
Located in the
Saqqara necropolis of
Egypt,
the pyramid was constructed in the 27th century BC and is one of the
oldest pyramids known.
The two-image composite includes a foreground image taken during evening
blue hour,
and a background image captured from the same location the following morning.
The morning planet line-up is
slowly changing.
At the end of last month, planets
Jupiter and Venus switched places,
while at the end of this month, Jupiter and Mars will switch after passing
within one-degree of each other.
Of course, this picturesque planetary angular alignment is a coincidence, as
all of these worlds continue to orbit
the Sun as they have for billions of years,
well before even the
ancient Pyramid of Djoser was built.
APOD: 2022 April 26 - Planet Parade over Sydney Opera House
Explanation:
The world is waking up to a picturesque planet parade.
Just before dawn, the eastern skies over much of
planet Earth
are decorated by a notable line of familiar planets.
In much of Earth's northern hemisphere, this
line of planets appears most
nearly horizontal,
but in much of
Earth's southern hemisphere, the line appears more nearly vertical.
Pictured over the
Sydney Opera House in southern
Australia,
the planet line was captured nearly vertical about five days ago.
From top to bottom, the morning planets are
Saturn,
Mars,
Venus, and
Jupiter.
As April ends, the angular distance between Venus and Jupiter will gradually pass below a degree as they switch places.
Then, as May ends,
Jupiter will pass near Mars as those two planets
switch places.
In June, the parade will briefly expand to include Mercury.
APOD: 2022 April 20 - Planet Line over New York Bridge
Explanation:
There's an interesting sky to see if you wake up before the Sun.
Lined up
on toward the eastern horizon are four planets in a row.
The planets are so bright they can even be seen from the
bright sky inside a city.
In fact, the featured image was taken from New York City, USA,
with the foreground highlighted by the
RFK
(Triborough)
Bridge.
Pictured, the planets are, left to right,
Jupiter,
Venus,
Mars, and
Saturn.
The planets all appear
in a row because they all orbit the
Sun in the same
plane.
This plane, called the
ecliptic plane, was created in the early days of our
Solar System and includes all planets, including
Earth.
The morning
planet parade will continue throughout April and May,
and will even be joined by
Mercury in June.
APOD: 2015 November 12 - Kenya Morning Moon, Planets and Taurid
Explanation:
On November 8, a waning crescent Moon joined the continuing
parade of planets
in Earth's early morning skies.
Captured here from
Amboseli National Park, Kenya, even
the overexposed moonlight can't washout brilliant Venus
though, lined up near the ecliptic plane with faint Mars and
bright Jupiter above.
As if
Moon and planets
aren't enough, a comparably bright Taurid meteor also
streaks through the scene.
In fact November's
Taurid meteor showers
have had a high proportion of bright fireballs.
Apparently streaming from radiants in Taurus, the meteors
are caused by our fair planet's
annual passage through
debris from Comet 2P/Encke.
The comet's dust grains are
catching up with Earth's atmosphere at a relatively low
speed of about 27 kilometers per second.
APOD: February 3, 1997 - Stars Without Galaxies
Explanation:
Galaxies are made up
of stars, but are all stars found
within galaxies?
Apparently not. Using the Hubble Space Telescope,
researchers exploring
the Virgo Cluster of galaxies have now found about 600
red giant stars adrift in intergalactic space.
Above is an artist's vision of the sky from a hypothetical planet
of such a lonely sun.
The night sky on a world orbiting an intergalactic star
would be a stark contrast to Earth's - which features
a nightly parade of stars, all members of
our own Milkyway galaxy.
As suggested by the illustration, a setting swollen red sun
would leave behind a dark sky speckled only with faint, fuzzy,
apparitions of
Virgo Cluster galaxies.
Possibly ejected from their home galaxies during
galaxy-galaxy collisions, these isolated suns
may well represent part of a large,
previously unseen stellar population,
filling the the space between Virgo cluster galaxies.