Science

In order to reproduce, most flowering plants rely on animals to move their pollen. In turn, pollinators rely on flowers for food, including both nectar and pollen. If you’re a gardener, you might want to support this partnership by planting flowers. But if you live in an area without a lot of green space, you might wonder whether it’s worth the effort.

I study bees and other pollinators. My new research shows that bees, in particular, don’t really care about the landscape surrounding flower gardens. They seem to zero in on the particular types of flowers they like, no matter what else is around.

Bird flu continues to spread across the United States after jumping from chickens and turkeys to cow milk and humans. The first death was reported this week in Louisiana after a 65-year-old man with underlying medical conditions succumbed to the flu.

CNN reported that a recent study by scientists at the Centers for Disease Control and Prevention investigated the first 46 cases of bird flu in the United States in 2024. Nearly all of those were considered to be mild, with the exception of one person who had been exposed to infected farm animals.

A controversial new study out Monday in a U.S. medical journal could reignite debate over fluoride's safety in water, linking higher exposure levels to lower IQ in children.

Published in the prestigious Journal of the American Medical Association (JAMA) Pediatrics, it has sparked pushback from some scientists who criticize the study's methods, defend the mineral's proven dental benefits, and warn the findings may not directly apply to typical US water fluoridation levels.

In addition to the annual parade of star pictures or constellations passing above our heads each night, there are always exciting events to look out for in the sky. The year 2025 is no exception and has its fair share of such events.

Though the night sky is more spectacular from a dark country sky, you can see the events outlined here even if, like many others, you live in a light-polluted city. For most events you do not need a telescope or binoculars.

Here are some of the highlights.

March and September: eclipses of the Moon

During the early morning of Monday 8 September, the full Moon will move into the shadow of Earth and be totally eclipsed. The Moon will turn a red or coppery colour, because sunlight is bent or refracted by Earth’s atmosphere onto the Moon. The bent light is red, as we are looking at the reflection of sunrises and sunsets from around the globe.

Total eclipses of the Moon are more common than those of the Sun. They can be seen from all the regions on Earth where it is night.

Unlike eclipses of the Sun, lunar eclipses are safe to watch with the unaided eye. They are also safe to photograph. A tripod will help, as will a camera or phone able to take timed exposures.

The eclipse starts with Earth’s shadow gradually covering the Moon over about an hour. Similarly, after totality the shadow takes about an hour to leave the Moon.

Seen from Australia’s east coast, the total eclipse will last from from 3:30am to 4:53am on September 8. From New Zealand, this will be from 5:30am to moonset; from South Australia or the Northern Territory, 3:00am to 4:23am, and from Western Australia 1:30am to 2:53am.

Earlier in the year, on the evening of Friday March 14, people in Aotearoa New Zealand will be able to see a totally eclipsed Moon as it rises above the horizon just after sunset. Watchers in eastern Australia will also get a brief glimpse of a partially eclipsed Moon after moonrise, for 34 minutes from Sydney, 43 minutes from Brisbane and 16 minutes from Cairns.

March: Saturn’s ‘disappearing’ rings

Gazing at Saturn and its rings through a telescope is always a thrill, whether you are seeing them for the first or the hundredth time. However, in early 2025 the rings will seem to vanish as Earth passes through the plane of the rings.

This phenomenon occurs twice during Saturn’s 29-year path around the Sun, that is, at roughly 15-year intervals. Unfortunately, on March 24, the date when this will occur, the planet will be too close to the Sun in the sky for us to observe.

However, in the evenings until mid-February and in the morning from late March we will be able to see Saturn with quite narrow, tilted rings.

Note that a small telescope is needed to see Saturn with or without its rings. If you don’t have one yourself, you can go on a night tour at a public observatory like Sydney Observatory or an observing session with a local astronomical group, such as those at Melbourne Observatory with the Astronomical Society of Victoria.

May and December: meteor showers

The Eta Aquariids seen from Chile in 2022. Petr Horálek / ESO, CC BY

The two main meteor showers of the year are the Eta Aquariids and the Geminids.

In 2025, the Eta Aquariids are best seen on the morning of Wednesday May 7, while the Geminids will be most visible on the mornings of Sunday December 14 and Monday December 15.

This year, viewing conditions for both meteor showers are favorable, in the sense that there will be no bright Moon in the sky during those mornings. To see them, look towards the north-east (Eta Aquariids) and north (Geminids) before dawn starts brightening the sky.

The darker the sky you can find, the better. Keep away from street lights or any other light.

January, April and August: planets

The five planets you can see with the naked eye – Mercury, Venus, Mars, Jupiter and Saturn – move across the sky along a line called the ecliptic.

As the planets move, they sometimes appear to pass close to each other and take on interesting patterns. Of course, they only appear close from our point of view. In reality the planets are tens or hundreds of million kilometers apart.

In 2025, these patterns include:

• January 18–19: the brightest planet, Venus, is close to the ringed planet Saturn in the evening sky
• April 1–15: Mercury, Venus and Saturn form a slowly changing compact group in the eastern sky near sunrise
• August 12–13: Venus and Jupiter, the two brightest planets, are only separated by two moon-widths in the morning sky.

June and August: constellations

As the year progresses, different constellations appear in the evening sky. The perpetual chase of Orion and Scorpius (the hunter and the scorpion) across the sky was noted in 2024.

In 2025, keep an eye on the Southern Cross (known as Crux to astronomers) and Sagittarius (the archer).

The Southern Cross is the best-known constellation in the southern sky. It is easy to find, as it is made up of a compact group of bright stars in the shape of a cross.

Two pointer stars from the neighboring constellation of Centaurus, the centaur, also help to show its position. From Sydney and further south, the Southern Cross is always above the horizon. However, in the evenings, it is best viewed around June, when it is high in the southern sky.

The constellation Sagittarius is next to Scorpius. In the evenings, it is best placed for observation in August, as at that time of the year it is directly overhead.

A join-the-dots look at the brightest stars of the constellation gives the impression of a teapot, and it is often referred to by that name. Sagittarius is an important constellation for Australian astronomers, as it contains the centre of the Milky Way galaxy.

NASA’s upcoming Artemis II mission is slated to return astronauts to the Moon no sooner than April 2026. Astronauts were last on the Moon in 1972 during the Apollo 17 mission.

Artemis II will utilize NASA’s Space Launch System, which is an extremely powerful rocket that will enable human space exploration beyond Earth’s atmosphere. The crew of four will travel in an Orion spacecraft, which the agency launched around the Moon and successfully returned during the Artemis I mission.

We all know that time seems to pass at different speeds in different situations. For example, time appears to go slowly when we travel to unfamiliar places. A week in a foreign country seems much longer than week at home.

Time also seems to pass slowly when we are bored, or in pain. It seems to speed up when we’re in a state of absorption, such as when we play music or chess, or paint or dance. More generally, most people report time seems to speed up as they get older.

The United States' top government doctor on Friday called for health warnings on alcoholic drinks to highlight that they cause cancer and urged a reassessment of daily consumption limits due to the risks.

Surgeon General Vivek Murthy said that the connection between alcohol and cancer has been known since the 1980s, with mounting evidence reinforcing the dangers. Yet, mandatory warning labels fail to address the health threat.

In the grand scheme of things, 45 years is not a long time. Back in 1980, it would take me three weeks to run a computer program, written in the programming language Cobol, that worked using punched cards. Each card represented one line of code and it required multiple re-punches to correct errors. Eventually, I would have a working program that did something useful.

How times have quickly changed in technology – now, my mobile phone has vast processing capability compared to the machine that processed that Cobol program. With the help of artificial intelligence (AI) tools, that same phone is able to instantly translate between languages on a live call, among many other features.

In a world where information flows freely, it’s easy to forget that, for centuries, knowledge was much harder to come by. Imagine living in a time when the internet didn’t exist, books were scarce, libraries were few, and most people couldn’t even read.

This was the world of Isidore of Seville, a man dedicated to gathering and sharing knowledge to be passed down for generations.

by Sam Davies, with Jing Xuan Teng in Shanghai

Last year was China's hottest on record and the past four years were its warmest ever, its weather agency said this week.

Junk food companies are starting to get nervous over how many Americans use GLP-1 medications to lose weight.

Washington Post columnist Catherine Rampell walked through shocking details of the economic impact of drugs like Wegovy and Ozempic cited in a new study by Cornell University and Numerator.

By the end of this decade, nations and private companies may well be mining the surface of the Moon.

But as space becomes accessible to more nations and corporations, we need to stop and ask ourselves what commercial activities we want to allow, including on the Moon.

Beijing insisted on Tuesday that it had shared information on Covid-19 "without holding anything back", after the World Health Organization implored China to offer more data and access to understand the disease's origins.

Covid-19, which first emerged in the central Chinese city of Wuhan in December 2020, went on to kill millions of people, shred economies and overwhelm health systems.