james webb telescope
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James Webb Telescope

Telescopes can look back in time because light takes time to travel from one place to another. When we see distant objects, we are not seeing them how they are now, instead, we are seeing how they are when they emitted that light. For example, JWST spotted the death of a star about 2500 light-years (2500 * 9.5 trillion km) away. So, that death of a star happened not now but 2500 years ago.
global warming
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Global warming – Causes, Effects & Solutions

Global warming is heating up of earth due to the presence of CO2 and other greenhouse gas emissions in the air. The greenhouse gases trap the sun’s heat. Using renewable energy sources such as solar energy, and wind energy as alternatives to burning fossil fuels can prevent further increases of greenhouse gases in the atmosphere. Moreover, Sustainable and eco-friendly living can reverse global warming.
Omicron
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Omicron

The detection of Omicron is reiterating the importance of increasing the availability of vaccines to low-income countries. At present, only 3% of people in low-income countries received two vaccine doses, compared with more than 60% in high-income countries.